單項(xiàng)選擇題(), the following possible causes should be investigated.

A.Should the engine stop without apparent reason
B.The engine should stop without apparent reason
C.The engine stops without apparent reason
D.The engine is stopped without apparent reason


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2.單項(xiàng)選擇題()does it take to change the main engine from ahead to astern?

A.How many times
B.How much water
C.How long
D.How length

3.單項(xiàng)選擇題(), we continued lifting out the pistons.

A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late

5.單項(xiàng)選擇題When entering a foam injected space () breathing apparatus.

A.put out
B.put on
C.take off
D.take in