单项选择题
The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.
A.in which
B.on which
C.to which
D.by which
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（）during the last repair?
A.Did you have No.4 cylinder repair
B.Do you have No.4 cylinder repaired
C.Didn’t you have No.4 cylinder repairing
D.Didn’t you have No.4 cylinder repaired -
单项选择题
Hardly had the engine started （） the temperature of the cooling water suddenly rose up to 40℃.
A.then
B.than
C.when
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The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel （）within half the range of visibility.
A.stopping
B.being stopped
C.to stop
D.to be stopped
