排水泵站的基本组成有哪些。
参考答案：
机器间、集水池、格栅、辅助间。
The Great Wall travel _______deep valleys, ________deserts and ________mountains.
A．over, across, through
B．through, over, across
C．across, through, over
D．through, across, over
Give the logical variables X=0, Y=1, The value of X∧Y(logical multiply) is( ).
A．1
B．2
C．10
D．0
