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單項(xiàng)選擇題

Most propellers on merchant vessels are constructed of（）.

A.managanese bronze
B.cast iron
C.mild steel
D.improved plow steel

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單項(xiàng)選擇題

Mr.Jones was tired , he will（）over his duty of look out to another sailor.

A.take
B.think
C.hand
D.get

單項(xiàng)選擇題

My ship is equipped（）automatic hatch covers.

A.with
B.by
C.on
D.in

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