单项选择题

Heavy cargo might break （）cargo, so it can’t be stowed on top of it.

A.light
B.bulk
C.dangerous
D.wet

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单项选择题

Cargo for （）No.4 is to be loaded first.

A.room
B.cabin
C.hold
D.winch

单项选择题

Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.

A.checked
B.closed
C.removed
D.cleared

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