影响水电厂最高出力的两大水利要素是（）。
A.库容
B.水头
C.存水量
D.发电流量
参考答案：B, D
Loud noise may cause hearing ______ for a short time or even for ever. [ ]
A. results
B. questions
C. accidents
D. problems
A partial deck in a hold is called a(n)（）.
A.weather deck
B.orlop deck
C.shelter deck
D.main deck
