单项选择题

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

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

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单项选择题

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

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

单项选择题

Before opening and closing the hatches, the spaces around the covers, all the parts and the gears should be （）.

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

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