單項(xiàng)選擇題

（） 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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單項(xiàng)選擇題

（）, we kept removing the pistons.

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

單項(xiàng)選擇題

The value of GM still remains one meter, meanwhile we can pump the ballast water to（） the ship on even keel.

A.make
B.put
C.keep
D.get

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