單項(xiàng)選擇題

（） 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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單項(xiàng)選擇題

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

A.slip
B.sidewise force
C.rotational force
D.thrust

單項(xiàng)選擇題

The fog is lifted，so（）the radar．

A.close
B.open
C.switch off
D.switch on

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（） may not justify detention.

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

The fog is lifted，so（）the radar．