單項選擇題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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1.單項選擇題Mr.Jones was tired , he will（）over his duty of look out to another sailor.
A.take
B.think
C.hand
D.get
2.單項選擇題My ship is equipped（）automatic hatch covers.
A.with
B.by
C.on
D.in
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According to the relevant regulation, lifeboat should be powered by（）.
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