單項選擇題

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

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

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單項選擇題

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

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

單項選擇題

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