If the hatch cover does not move, （）should be checked.

单项选择题To ensure the safety in operating hatch covers, oil the moving parts （）.

A. monthly
B. every three months
C. once monthly
D. every two months

单项选择题During operation, the （）should check the working condition of the derrick.

A.foreman
B.operator
C.opener
D.stevedore

单项选择题（）has more than ten percent broken wires. Stop using it at once.

A. The cargo runner
B. The cargo block
C. The derrick sling
D. The lashing wire

单项选择题It is flammable cargo. Keep it away from the （）.

A.gangway
B.bow
C.boiler
D.stern

单项选择题（）must be kept away from dry cargo.

A. Light cargo
B. Wet cargo
C. Heavy cargo
D. Bulk cargo