单项选择题
When the winch is in trouble, the sailor must call the （）(电工) to repair it.
A.carpenter B.rating C.electrician D.bosun
单项选择题 Sailors should know the （）(安全工作负荷量)of derricks.
单项选择题 Liquid bulk cargo is loaded and discharged by （）(泵).
单项选择题 （）(湿货)must be kept away from dry cargo.
