单项选择题

Raw la quer is（）corrosive nature.

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

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单项选择题
Roll-on roll-off ships are equipped with（）.

A.cargo elevators
B.conveyor belts
C.ramps
D.derricks and winches for cargo handling
单项选择题
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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