单项选择题
（） thrust and resistance equal each other, the ship always travels at a constant speed.
A.As long as
B.As far as
C.As well as
D.Unless
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A.Late as it was
B.As it was late
C.Since it was late
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A.make
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C.keep
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After the order “（）” is given, the air system is shut down, the turning gear put in, all drains and indicator cocks opened, and the cooling water and lubricating oil systems kept running.
A.Stand-by Engine
B.Stop Engine
C.Finished With Engine
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