單項(xiàng)選擇題We have stayed at Shanghai port for a long timeThe fouling on the ship’s hull greatly increases her ().

A.power
B.speed
C.resistance
D.thrust force


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1.單項(xiàng)選擇題We’d better ()economic speed ()fuel consumption.

A.take;save
B.to take;save
C.take;to save
D.to take;to save

2.單項(xiàng)選擇題This machine ()out of order very often, but now it works well.

A.is used to be
B.was used to be
C.used to be
D.was used to

3.單項(xiàng)選擇題When we arrived here yesterday, their ship ()for three days.

A.has left
B.had left
C.has been away
D.had been away

4.單項(xiàng)選擇題The accident resulted () the motorman’s carelessness.

A.in
B.to
C.from
D.by

5.單項(xiàng)選擇題The second engineer seemed to know what the sign ().

A.stand by
B.stand for
C.stood by
D.stood for