单选题If 0>ab3c4, then which of the following must be true?Ⅰ. ab is positiveⅡ. ab is negativeⅢ. abc is negativeA Ⅰ onlyB Ⅱ onlyC Ⅲ onlyD Ⅰ and Ⅲ onlyE Ⅱ and Ⅲ only

题目
单选题
If 0>ab3c4, then which of the following must be true?Ⅰ. ab is positiveⅡ. ab is negativeⅢ. abc is negative
A

Ⅰ only

B

Ⅱ only

C

Ⅲ only

D

Ⅰ and Ⅲ only

E

Ⅱ and Ⅲ only

相似考题

1.Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?()A. A must contain all of the characters defined in BB. A must be UnicodeC. The encoded values in A must match the encoded values in B for all characters defined in BD. A must be a multibyte character setE. The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B

2.The man page for command shows the following syntax: The man page for command shows the following syntax: command [ －a | －b ] Which of the following statements is true regarding this entry?()A. Either the -a or flag -b may be used, but not both.B. If the flag -a is used then the flag -b also must be used.C. One of the -a or -b flags must be used, but not both at the same time.D. Both the flags may be used together, but neither are mandatory.

3.Given two different character sets （A and B）， which of the following must be true for A to be considered a strict superset of B？（）A、 A must contain all of the characters defined in BB、 A must be UnicodeC、 The encoded values in A must match the encoded values in B for all characters defined in B D、 A must be a multibyte character setE、 The encoded values in A must match the encoded values in B for all numeric and alphabetic character

4.Which of the following is true of an index used to support a UNIQUE constraint?()A.It must have the UNIQUE attribute.B.It cannot be created explicitly by the user.C.It must have the UNIQUE and CLUSTER attributes.D.It must have the UNIQUE WHERE NOT NULL attribute.

参考答案和解析
正确答案： E
解析：
Since ab3c4is negative and c4 is positive, then in ab3 one variable is positive and the other negative. Hence ab<0, or negative, so Ⅰ is false and Ⅱ is true. Now let’s look at Ⅲ. You know ab is negative — but you don’t know a thing about C. It could be positive or negative. So cross out E..
更多“If 0>ab3c4, then which of the following must be true?Ⅰ. ab i”相关问题

  • 第1题：

    Which of the following are true statements regarding the characteristics of OSPF areas? Select all that apply.（）

    • A、All OSPF networks require the use of multiple areas
    • B、Multiple OSPF areas must connect to area 0
    • C、Single area OSPF networks must be configured in area 1
    • D、Areas can be assigned any number from 0 to 63535
    • E、Area 0 is called the backbone area
    • F、Each OSPF area need to be configured with a loopback interface

    正确答案:B,E

  • 第2题：

    Which of the following statements is TRUE about the primary system dump device?（）

    • A、 It is shared. 
    • B、 It must be /dev/hd6. 
    • C、 It must be an internal disk. 
    • D、 It can be an external device.

    正确答案:D

  • 第3题：

    You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i database. As a part of the upgrade process，you execute the following script：   SQL>@utlu111i.sql   Which statement about the execution of this script is true？（）

    • A、 It must be executed from the Oracle Database 11g environment.
    • B、 It must be executed only after the SYSAUX tablespace has been created.
    • C、 It must be executed from the environment of the database that is being upgraded.
    • D、 It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.
    • E、 It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.

    正确答案:C

  • 第4题：

    Which of the following is true of an index used to support a UNIQUE constraint?（）

    • A、It must have the UNIQUE attribute.
    • B、It cannot be created explicitly by the user.
    • C、It must have the UNIQUE and CLUSTER attributes.
    • D、It must have the UNIQUE WHERE NOT NULL attribute.

    正确答案:A

  • 第5题：

    多选题
    If p and q are primes greater than 2, which of the following statements must be true? (Indicate all such statements.)
    A

    p + q is even

    B

    pq is odd

    C

    p2-q2 is even


    正确答案： A,B
    解析：
    由于所有大于2的质数都是奇数，因此p和q均是奇数，两奇数相加为偶数，所以A项正确；两奇数的乘积还是奇数，所以B项正确；两奇数的平方还各自是奇数，而两奇数的平方之差是偶数，因此C项也正确；所以选择A、B、C三项。

  • 第6题：

    单选题
    Which of the following is true of an index used to support a UNIQUE constraint?（）
    A

    It must have the UNIQUE attribute.

    B

    It cannot be created explicitly by the user.

    C

    It must have the UNIQUE and CLUSTER attributes.

    D

    It must have the UNIQUE WHERE NOT NULL attribute.


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    If a3b2c<0, which of the following must be less than zero?
    A

    a2c

    B

    ab

    C

    ac

    D

    bc

    E

    ac2


    正确答案： D
    解析：
    If a3b2c<0,  then either a or c is negative, but both cannot be negative.  A negative times a positive is negative. So ac<0.

  • 第8题：

    单选题
    If (c+1)2＝-b, which of the following statement could be true?I. c>0II. c＝0III. c<0
    A

    None

    B

    I only

    C

    III only

    D

    I and II only

    E

    I, II, and III


    正确答案： D
    解析：
    假设c=5，那么b＝-36。假设c＝0, b＝-1。假设c＝-5, b＝-16。所以I. II. III都有可能。

  • 第9题：

    多选题
    Which of the following are true statements regarding the characteristics of OSPF areas? Select all that apply.（）
    A

    All OSPF networks require the use of multiple areas

    B

    Multiple OSPF areas must connect to area 0

    C

    Single area OSPF networks must be configured in area 1

    D

    Areas can be assigned any number from 0 to 63535

    E

    Area 0 is called the backbone area

    F

    Each OSPF area need to be configured with a loopback interface


    正确答案： D,B
    解析： 暂无解析

  • 第10题：

    单选题
    A die whose faces are numbered from l to 6 is rolled. Which of the following statements must be true?Ⅰ. The probability of getting a 4 on the top face is 2/3.Ⅱ. The probability of getting an odd number on the top face is 1/2.Ⅲ. The probability of getting a prime number on the top face is 1/2.
    A

    Ⅰand Ⅱ only

    B

    Ⅱ and Ⅲ only

    C

    Ⅰ and Ⅲ only

    D

    Ⅱ only

    E

    Ⅰ, Ⅱ, and IⅢ


    正确答案： E
    解析：
    There are total six different results when the die is rolled. Since any one of the six numbers many show up on the top face, the probability of getting a 4 on the top face is 1/6. Hence, Roman numeral Ⅰ is not true. Statement Ⅱ is true. Since there are three prime numbers, the probability is 3/6 or 1/2. Hence, Roman numeral Ⅲ is true.

  • 第11题：

    单选题
    With regard to the drivers behind Application Grid based computing， consider the following statements and indicate which is TRUE:// （）  I. data center complexity leads to lack of predictability making it difficult if not impossible to guarantee quality of service  II. data centers must do more with less and find a way to better utilize existing capacity  III. growth means added complexity
    A

     I and II

    B

     I and III

    C

     II and III

    D

     I， II and III


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i database. As a part of the upgrade process，you execute the following script：   SQL>@utlu111i.sql   Which statement about the execution of this script is true？（）
    A

     It must be executed from the Oracle Database 11g environment.

    B

     It must be executed only after the SYSAUX tablespace has been created.

    C

     It must be executed from the environment of the database that is being upgraded.

    D

     It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.

    E

     It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.


    正确答案： B
    解析： 暂无解析

  • 第13题：

    Which of the following is TRUE about a caching name server？（）

    • A、They must have a trusted SSL certificate
    • B、They can be authoritative
    • C、They cannot be load-balanced
    • D、They can be recursive
    • E、They require DHCP

    正确答案:B,D

  • 第14题：

    The man page for command shows the following syntax: The man page for command shows the following syntax: command [ -a | -b ] Which of the following statements is true regarding this entry?（）

    • A、Either the -a or flag -b may be used, but not both.
    • B、If the flag -a is used then the flag -b also must be used.
    • C、One of the -a or -b flags must be used, but not both at the same time.
    • D、Both the flags may be used together, but neither are mandatory.

    正确答案:D

  • 第15题：

    An operator must check the status of print queues on a regular basis. Which of the following commands can be used to check on all the print queues?（）

    • A、lslp -a
    • B、qchk -A
    • C、enq -s ALL
    • D、lpstat -p ALL

    正确答案:B

  • 第16题：

    单选题
    a and b are positive, a is even and b is odd. Which of the following must also be odd?
    A

    ab

    B

    a/b

    C

    a + 2b

    D

    ba

    E

    (ab) a


    正确答案： D
    解析：
    An odd number raised to an even power equals an odd number. Take 32 = 9, for example, ba is the correct answer.

  • 第17题：

    单选题
    If 0>ab3c4, then which of the following must be true?Ⅰ. ab is positiveⅡ. ab is negativeⅢ. abc is negative
    A

    Ⅰ only

    B

    Ⅱ only

    C

    Ⅲ only

    D

    Ⅰ and Ⅲ only

    E

    Ⅱ and Ⅲ only


    正确答案： B
    解析：
    Since ab3c4is negative and c4 is positive, then in ab3 one variable is positive and the other negative. Hence ab<0, or negative, so Ⅰ is false and Ⅱ is true. Now let’s look at Ⅲ. You know ab is negative — but you don’t know a thing about C. It could be positive or negative. So cross out E..

  • 第18题：

    单选题
    If m and n are positive integers and 3m+n-1=2m+2n, which of the following must be true?I. m and n are consecutive integers.II. m is even.III. n is odd.
    A

    None

    B

    I only

    C

    II only

    D

    III only

    E

    I, II, and III


    正确答案： D
    解析：
    Since m=n+1, where m and n are given as positive integers, Roman numeral choice I is true. Since, m=n+1, m can be either odd or even, hence choice II is false. Roman numeral choice III is also false since n can be either even or odd.

  • 第19题：

    单选题
    For all real values of x and y, let x◆y be defined by the equation x◆y = 2 -xy. If -1 < a < 0 and 0 < b < 1, then which of the following must be true?
    A

    -2<a+b<-1

    B

    -l<a+b<0

    C

    0<a+b<l

    D

    l<a+b<2

    E

    2<a+b<3


    正确答案： B
    解析：
    根据题干，发现a= -1/2, b =1/2满足已知条件，a◆b=2-ab，将a= -1/2, b =1/2代入进去，则(-1/2) ◆(1/2) = 2 - (-1/2)(1/2) = 2 + 1/4 = 2.25，故选E。

  • 第20题：

    多选题
    Given two different character sets (A and B), which of the following must be true for A to be considered a strict superset of B?（）
    A

    A must contain all of the characters defined in B

    B

    A must be Unicode

    C

    The encoded values in A must match the encoded values in B for all characters defined in B

    D

    A must be a multibyte character set

    E

    The encoded values in A must match the encoded values in B for all numeric and alphabetic characters in B


    正确答案： E,C
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following must be true?I. a Φ b=b Φ aII. a Φ (a + 1) = a2III. a/2 Φ b/2 = aΦb/2
    A

    I only

    B

    II only

    C

    III only

    D

    I and III only

    E

    II and III only


    正确答案： C
    解析：
    Determine whether each Roman numeral equation is true or false when a Φ b = ab - a.
    ~ I. Since b Φ a = ab－b and ab－a is not necessarily equal to ab－b, a Φ b = b Φ a is not always true. Equation I need not be true.
    ~ II. To evaluate a Φ (a + 1), let b = a + 1: a Φ (a + 1) = a (a + 1)-a =a2 + a－a = a2. Hence, equation II must be true.

  • 第22题：

    单选题
    Which of the following statements is TRUE about the primary system dump device?（）
    A

     It is shared. 

    B

     It must be /dev/hd6. 

    C

     It must be an internal disk. 

    D

     It can be an external device.


    正确答案： A
    解析： 暂无解析

  • 第23题：

    多选题
    Which of the following is TRUE about a caching name server？（）
    A

    They must have a trusted SSL certificate

    B

    They can be authoritative

    C

    They cannot be load-balanced

    D

    They can be recursive

    E

    They require DHCP


    正确答案： E,C
    解析： 暂无解析

  • 第24题：

    单选题
    If a-b＝0, which of the following must be equal to a b ?
    A

    2a

    B

    2b

    C

    a2

    D

    a

    E

    o


    正确答案： A
    解析：
    因为a-b=0，所以ab=a×a=a2，故选C项。

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