Some kinds of winds might cause illness or health problems, because().A、winds from mountain regions blowing faster and faster warm and dry the airB、researchers say there are more strokes and heart attacks during windy weather of this kindC、bad headaches a

题目

Some kinds of winds might cause illness or health problems, because().

A、winds from mountain regions blowing faster and faster warm and dry the air

B、researchers say there are more strokes and heart attacks during windy weather of this kind

C、bad headaches and asthma attacks are some possible examples of the effects of the winds


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  • 第1题:

    有SQL语句: SELECTDISTINCT系号FROM教师WHERE工资>=; ALL(SELECT工资FROM教师WHERE系号="02") 与如上语句等价的SQL语句是

    A.SELECTDISTINCT系号FROM教师WHERE工资>=; (SELECTMAX(工资)FROM教师WHERE系号="02")

    B.SELECTDISTINCT系号FROM教师WHERE工资>=; (SELECTMIN(工资)FROM教师WHERE系号="02")

    C.ELECTDISTINCT系号FROM教师WHERE工资>=; ANY(SELECT工资FROM教师WHERE系号="02")

    D.SELECTDISTINCT系号FROM教师WHERE工资>=; SOME(SELECT工资FROM教师WHERE系号="02")


    正确答案:A
    解析:本题SQL语句的含义是检索有教师工资大于或等于系号为“02”的所有教师工资的系号。ALL、ANY和SOME都是SQL语句中的量词,在进行比较运算时只要子查询中有一行能使结果为真,则结果为真,而ALL则要求子查询中的所有行都使结果为真时,结果才为真,因此在子查询中要使用MAX()函数求出“02”系的教师最高工资,其他系中只要有教师工资高于此函数值,结果便为真。

  • 第2题:

    有SQL语句:SELECT DISTINCT系号FROM教师WHERE 工资>=ALL (SELECT 工资FROM教师WHERE系号=\"02\") 与如上语句等价的SQL语句是

    A.SELECT DISTINCT系号FROM教师WHERE工资>=(SELECT MAX(工资)FROM教师WHERE 系号="02")

    B.SELECT DISTINCT系号FROM教师WHERE工资>=(SELECT MIN(工资)FROM教师WHERE 系号="02")

    C.SELECT DISTINCT系号FROM教师WHERE工资>=(ANY(SELECT(工资)FROM教师WHERE 系号="02")

    D.SELECT DISTINCT系号FROM教师WHERE工资>=(SOME (SELECT(工资)FROM教师WHERE 系号="02")


    正确答案:A

  • 第3题:

    The population between the age of 25 and 44 increased by 28.1%from 1980 to 1989 because()

    Athis was the period of large inflow of young immigrants

    Bthis was the birth age of the baby boomers.

    Cthe large number born during WW II reached this age bracket

    Dthose who were born in the period of baby boom reached this age bracket


    D

  • 第4题:

    有SQL语句: SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; ALL(SELECT 工资 FROM 教师 WHERE 系号 =“02”) 与如上语句等价的SQL语句是

    A.SELECT DISTINCT 系号 PROM 教师 WHERE 工资>=; (SELECT MAX(工资)FROM 教师 WHERE 系号=“02”)

    B.SELECT DISTINCT 系号 FROM 教师 WHERE 工资=; (SELECT MIN(工资)FROM 教师 WHERE 系号=“02”)

    C.SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; ANY(SELECT 工资 FROM 教师 WHERE 系号=“02”)

    D.SELECT DISTINCT 系号 FROM 教师 WHERE 工资>=; SOME(SELECT 工资 FROM 教师 WHERE 系号=“02”)


    正确答案:A
    解析:题干中的SQL语句的功能是:查询那些工资比02系工资都高的教师所在的系号,四个选项中只有选项A中的查询条件与此等价,用(SELECT MAX(工资)FROM…WHERE…)实现选择出最高工资,故选项A为正确答案。选项B的查询条件表示工资大于02系中工资最低的教师的工资,选项C和D中的州Y和SOME是同义词,表示查询出只要比02系中某一个教师工资高的记录即可。

  • 第5题:

    对切换候选小区做PBGT过滤时,参数HO_MARGIN_QUAL(0,n)是对哪类切换触发原因的小区做过滤()

    A.Cause2

    B.Cause4

    C.Cause7

    D.Cause15


    参考答案:A, B, C

  • 第6题:

    重新加载fstab文件中的所有条目,需要使用的命令是()。

    A.mount -d

    B.mount -c

    C.mount -a

    D.mount -b


    mount -a