单选题x, y, and z are positive integers. Which of the following lists all the possible ways for x + y + z to be an odd number?I. One of the numbers is odd.II. Two of the numbers are odd.III. Three of the numbers are odd.A IB I and IIC I and IIID II and III

题目
单选题
x, y, and z are positive integers. Which of the following lists all the possible ways for x + y + z to be an odd number?I. One of the numbers is odd.II. Two of the numbers are odd.III. Three of the numbers are odd.
A

I

B

I and II

C

I and III

D

II and III


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更多“x, y, and z are positive integers. Which of the following li”相关问题
  • 第1题:

    计算z的值,当x大于等于y时,z=x;否则z=y。下列语句错误的是( )

    A.If x>=y Then z=x:z=y

    B.If x>=y Then z=x Else z=y

    C.z=y:If x>=y Then z=x

    D.If x<y Then z=y Else z=x


    正确答案:A

  • 第2题:

    计算z的值,当x大于y时,z=x;否则z=y。下列语句错误的是

    A.If x>=y Then z=x:z=y

    B.If x>=y Then z=x Else z=y

    C.z=y:If x>=y Then z=x

    D.If x<=y Then z=y Else z=x


    正确答案:A
    解析:选项A中的语句行有两条语句,执行If语句后,执行z=y语句,所以不管x是否大于y,最终x的值都等于y。

  • 第3题:

    Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main(String args[]) {   A x = new A();   B y = new B();   C z = new C();   // insert statement here   }   } 

    • A、x = y;
    • B、z = x;
    • C、y = (B) x;
    • D、z = (C) y;
    • E、y = (A) y;

    正确答案:C

  • 第4题:

    指出下列关系模式是第几范式?并说明理由。 (1)R(X,Y,Z)F={XY→Z} (2)R(x,Y,z)F={Y→z,XZ→Y} (3)R(X,Y,Z)F={Y→Z,Y→X,X→YZ} (4)R(x,Y,z)F={X→Y,X→Z} (5)R(x,Y,Z)F={XY→Z} (6)R(W,X,Y,Z)F={X→Z,WX→Y}


    正确答案: (1)R是BCNF。R候选关键字为XY,F中只有一个函数依赖,而该函数依赖的左部包含了R的候选关键字XY。
    (2)R是3NF。R候选关键字为XY和XZ,R中所有属性都是主属性,不存在非主属性对的候选关键字的传递依赖。
    (3)R是BCNF。R候选关键字为X和Y,∵X→YZ,∴X→Y,X→Z,由于F中有Y→Z,Y→X,因此Z是直接函数依赖于X,而不是传递依赖于X。又∵F的每一函数依赖的左部都包含了任一候选关键字,∴R是BCNF。
    (4)R是BCNF。R的候选关键字为X,而且F中每一个函数依赖的左部都包含了候选关键字X。
    (5)R是BCNF。R的候选关键字为XY,而且F中函数依赖的左部包含了候选关键字XY。
    (6)R是1NF。R的候选关键字为WX,则Y,Z为非主属性,又由于X→Z,因此F中存在非主属性对候选关键字的部分函数依赖。

  • 第5题:

    以下()程序段可以实施X、Y变量值的变换。

    • A、Y=X:X=Y
    • B、Z=X:Y=Z:X=Y
    • C、Z=X:X=Y:Y=Z
    • D、Z=X:W=Y:Y=Z:X=Y

    正确答案:C

  • 第6题:

    The following command is sued Show tech-support chassis x bmc y. Which c0mp0nent in chassis x will have its information shown?() 

    • A、all subcomponents
    • B、IOM y
    • C、compute node y
    • D、mezzanine adapter z in compute node y

    正确答案:C

  • 第7题:

    单选题
    x, y, and z are positive integers. Which of the following lists all the possible ways for x + y + z to be an odd number?I. One of the numbers is odd.II. Two of the numbers are odd.III. Three of the numbers are odd.
    A

    I

    B

    I and II

    C

    I and III

    D

    II and III


    正确答案: C
    解析:
    I. One of the numbers is odd. Let x be odd. Let y and z be even. y + z is even. An even plus an odd is odd, so x + y + z is odd.

  • 第8题:

    单选题
    Set X = even integers and Set Y = odd integers. Therefore X ∩ Y = ______.
    A

    prime numbers

    B

    integers

    C

    empty set

    D

    composite numbers

    E

    whole numbers


    正确答案: A
    解析:
    When two sets have nothing in common, we refer to their intersection as the empty set. There are two appropriate ways to denote the empty set: X∩Y={ } or X∩Y=φ.

  • 第9题:

    多选题
    Which of the following equations are for lines which are perpendicular to the line y=2x+4?
    A

    2y +x = 5

    B

    2y –x = 3

    C

    x + 2y = 7

    D

    x – 2y = 4

    E

    4y +2x = 0


    正确答案: C,B
    解析:
    直线y=2x+4的斜率为2,所以与其垂直的直线的斜率为-1/2,故本题选择ACE三项。

  • 第10题:

    单选题
    Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?()   class A {}   class B extends A {}   class C extends A {}   public class Q3ae4 {   public static void main(String args[]) {   A x = new A();   B y = new B();   C z = new C();   // insert statement here   }   }
    A

    x = y;

    B

    z = x;

    C

    y = (B) x;

    D

    z = (C) y;

    E

    y = (A) y;


    正确答案: C
    解析: 暂无解析

  • 第11题:

    多选题
    Given:  1.  public class ConstOver {  2.  public constOver(int x, int y, int z) {  3.  }  4.  }   Which two overload the ConstOver Constructor?()
    A

    ConstOver() {}

    B

    protected int ConstOver(){}

    C

    private ConstOver(int z, int y, byte x ) {}

    D

    public Object ConstOver(Int x, int y, int z) {}

    E

    pubic void ConstOver (byte x, byte y, byte z) {}


    正确答案: B,D
    解析: 暂无解析

  • 第12题:

    单选题
    Phil has x quarters, y dimes, and z nickels and nothing else. Which of the following expressions represents the amount of money that Phil has, in dollars?
    A

    0.25x + 0.10y + 0.05z

    B

    2.5x + 1. 0y + 0.5z

    C

    25x + 10y + 5z

    D

    0.25x + 0.10y + 0.5z

    E

    25x + 10y + 50z


    正确答案: C
    解析:
    Multiply the value of each coin by the number of coins and add. 0.25x + 0.10y + 0.05z.

  • 第13题:

    计算z的值,当x大于y时,z=x;否则z=y。下列语句错误的是( )

    A. If x>=y Then z=x : z=y

    B If x>=y Then z=x Else z=y

    C. z=y : If x>=y Then z=x

    D. If x<=y Then z=y Else z=x


    正确答案:D

  • 第14题:

    Which of the following shows the proper pronunciation of "whose" in the sentence "'In America, Li stayed in a family whose landlady could help him with his English"?

    A./hus/
    B./huz/
    C./hu:s/
    D./hu:z/

    答案:D
    解析:
    考查单词的重读。whose在这个定语从句中是关系代词,起连接作用,而且在从句中作定语,需要重读,发长音,因此D项正确。

  • 第15题:

    表示关系X<=Y<=Z的JAVA语言表达式为()。

    • A、(X<=Y)&&(Y<=Z)
    • B、(X<=Y)AND(Y<=Z)
    • C、(X<=Y<=Z)
    • D、(X<=Y)&(Y<=Z)

    正确答案:A

  • 第16题:

    判断下列关系模式可以达到的范式级别: 1)R(X,Y,Z)F={XY→Z} 2)R(X,Y,Z)F={Y→Z,XZ→Y} 3)R(X,Y,Z)F={Y→Z,Y→X,X→YZ} 4)R(X,Y,Z)F={X→Y,X→Z}


    正确答案: 1)R(X,Y,Z)F={XY→Z,Y→Z 达到1NF
    2)R(X,Y,Z)F={Y→Z,XZ→Y}达到3CNF
    3)R(X,Y,Z)F={Y→Z,X→YZ}达到2NF
    4)R(X,Y,Z)F={X→Y,X→Z} 达到BCNF

  • 第17题:

    当y处于闭区间[x,z]时,值为真的表达式是()

    • A、(y<=z)&&(y>=x)
    • B、(x>=y)and(y>=z)c
    • C、(x>=y>=z)
    • D、(x>=y)&(y>=z)

    正确答案:A

  • 第18题:

    public class ConstOver {  public ConstOver (int x, int y, int z)  {  }  }   Which two overload the ConstOver constructor?()   

    • A、 ConstOver ( ) { }
    • B、 Protected int ConstOver ( ) { }
    • C、 Private ConstOver (int z, int y, byte x) { }
    • D、 Public Object ConstOver (int x, int y, int z) { }
    • E、 Public void ConstOver (byte x, byte y, byte z) { }

    正确答案:A,C

  • 第19题:

    问答题
    x, 2y, and 2z-1 are consecutive integers.

    正确答案: B
    解析:
    因为x,2y,2z-1是三个连续数字,所以2z-1>2y,所以z-y>1/2>0,所以A小于B,故本题选择B项。

  • 第20题:

    多选题
    If x and y are both positive even integers, which of the following expressions must be even? (Select all such expressions.)
    A

    xy

    B

    (x+1)y

    C

    x(y+1)


    正确答案: B,A
    解析:
    由于题目中x和y是变量,可以根据题干给出的条件给x, y设定符合条件的数值,代入各选项,看结果是否符合题干要求,即可得出答案。

  • 第21题:

    填空题
    y = mx2In the equation above, m is a constant. If y = 32 when x = 4, then when y = 18, which of the following could be the value of x?____

    正确答案: B
    解析:
    因为y = mx2 ,将x = 4, y = 32代入到等式中32 = m(4)2,2 = m,将y=18代入到y=2x2 ,2x2=9,x=-3或x=3。

  • 第22题:

    多选题
    public class ConstOver {  public ConstOver (int x, int y, int z)  {  }  }   Which two overload the ConstOver constructor?()
    A

    ConstOver ( ) { }

    B

    Protected int ConstOver ( ) { }

    C

    Private ConstOver (int z, int y, byte x) { }

    D

    Public Object ConstOver (int x, int y, int z) { }

    E

    Public void ConstOver (byte x, byte y, byte z) { }


    正确答案: B,C
    解析: 暂无解析

  • 第23题:

    单选题
    Which of the following choices could be equal to set Z ifX = {2, 5, 6, 7, 9} and Y = {2, 5, 7}X ∪ Y ∪ Z = {1, 2, 3, 4, 5, 6, 7, 8, 9}X ∩ Z = {2, 6}Y ∩ Z = {2}
    A

    Z= {1, 4, 8}

    B

    Z= {1, 3, 8}

    C

    Z= {1, 3, 4, 8}

    D

    Z= {1, 2, 3, 4, 6, 8}

    E

    Z= {1, 2, 3, 5, 6, 8}


    正确答案: B
    解析:
    We know that: X = {2, 5, 6, 7, 9} and Y = {2, 5, 7}, XYZ = {1, 2, 3, 4, 5, 6, 7, 8, 9}. This tells us that Z must contain {1, 3, 4, 8} because these elements are in the union of X, Y, and Z but not in set X and not in set Y.
    We also know that: XZ = {2, 6}, YZ = {2}. This tells us that Z must also contain {2, 6}. Only choice D contains all these elements. Z = {1, 2, 3, 4, 6, 8}

  • 第24题:

    填空题
    星(xīng)期(qī)六(liù)怎(zěn)么(me)样(yàng)?____

    正确答案: D
    解析: 暂无解析