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【单选题】
查询员工表中所有比平均工资高的员工的信息A.
select * from 员工 where 薪金>(select avg(薪金) from 员工)
B.
select * from 员工 where 薪金> avg(薪金)
C.
select * from 员工 where 薪金>平均薪金
D.
select * from 员工 where 薪金>(select 平均薪金 from 员工)
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举一反三
【单选题】Which of the following is NOT true of Britain?
A.
It recycles 1 out of every 3 newspapers each year.
B.
It recycles 1 out of every 4 glass bottles and jars each year
C.
It recycles 1 out of every 4 items of clothing each year.
D.
It recycles 1 out of every 3 aluminium cans each year.
【单选题】下列关于鼠标事件描述有误的是
A.
click表示鼠标单击
B.
dblclick表示鼠标右击
C.
mousedown表示鼠标的按钮被按下
D.
mousemover表示鼠标进入某个对象范围,并且移动
【单选题】A ______ circuit is one in which the current flows in a single continous path and is of the same value at every point in circuit
A.
parallel
B.
series
C.
mixed
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