单项选择题

A.significant areas of damage or corrosionB.pitting of ……

（） may not justify detention.

A.significant areas of damage or corrosion
B.pitting of plating and associated stiffening in decks
C.pitting of hull affecting seaworthiness or strength to take local loads
D.the condition of such items as ladder ways，guard-rails，pipe coverings

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单项选择题The force exerted by a propeller which tends to throw the stern right or left is called（）.

A.slip
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C.rotational force
D.thrust

单项选择题The fog is lifted，so（）the radar．

A.close
B.open
C.switch off
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A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
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A.it increases the likelihood of collision between the towing vessel and the disabled vessel
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C.the monkey fist may injure someone
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