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【简答题】
(ex1)某河床的横断面如图5.8所示,为了计算最大的排洪量,需要计算它的断面积,试根据图示测量数据(单位:米)用梯形法计算其断面积。
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举一反三
【单选题】The violent disturbances in Bangkok had progressed to a point ________ the police had to drive away the protestants with tear gas．
A.
from which
B.
that
C.
where
D.
what
【单选题】The robber had escaped and was nowhere to be found when the police ______.
A.
arrived
B.
had arrived
C.
arrive
D.
have arrived
【简答题】What had the police found? His ______ .
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