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【单选题】
排水支管开孔后，再扩孔的目的是（）。
A.
减小阻力；
B.
削除孔边锐角、保护滤网；
C.
增加排水速度；
D.
保护支管。
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【单选题】In its early history, Chicago had floods frequently, especially in the spring, the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went somet...
A.
horses were fairly useful in Chicago
B.
Chicago"s streets were extremely muddy
C.
Chicago was very erous in the spring
D.
the Chicago people were particularly humorous
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【单选题】In its early history, Chicago had floods frequently, especially in the spring, the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went somet...
A.
horses were fairly useful in Chicago
B.
Chicago"s streets were extremely muddy
C.
Chicago was very erous in the spring
D.
the Chicago people were particularly humorous
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