單項(xiàng)選擇題Raw la quer is（）corrosive nature.
A.in
B.of
C.on
D.with
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1.單項(xiàng)選擇題Roll-on/roll-off ships are equipped with（）.
A.cargo elevators
B.conveyor belts
C.ramps
D.derricks and winches for cargo handling
2.單項(xiàng)選擇題Shall we（）wait at the roadstead till there is a free berth for us?
A.must
B.ought to
C.have to
D.never
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When the wave period and the apparent rolling period are the same（）.
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In the Northern hemisphere northerly winds may cause temperature（）.
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