单项选择题
A.wait B.wait for C.be waited D.be waited for
There shall be two principal （） through the harbor for ...
单项选择题There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．
A.straits B.channels C.canals D.roadsteads
The transfer procedures for oil products are required t...
单项选择题The transfer procedures for oil products are required to be posted （）.
A.in the pilothouse B.in the officer's lounge C.in the upper pumproom flat D.where they can be easily seen or readily available
The step of a pilot ladder which prevents the ladder fr...
单项选择题The step of a pilot ladder which prevents the ladder from twisting is the （）.
A.Proof bar B.Shifting bar C.Long bar D.Spreader
