单项选择题
A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.
A.be visible from both sides and from forward and aft
B.indicate NO SMOKING
C.be displayed only while transferring cargo and fast to a dock
D.use black lettering on a white background
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A SYSTEM OF CLEANING THE TANKS BY WASHING THEM WITH THE CARGO OF CRUDE OIL WHILE IT IS BEING DISCHARGED is known as（）.
A.COW
B.LOT
C.CBT
D.coferdam -
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When planning the loading or discharging of a VLCC (100，000 DWT+) what is the most important consideration?（）
A.Draft and trim
B.Limits of the bending moments
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In all cases，however，the capacity of segregated ballast tanks shall be（）such that，in any ballast condition at any part of the voyage，including the conditions consisting of lightweight plus segregated ballast only，the ship’s draughts and trim can meet the necessary requirements.
A.at least
B.at most
C.so big as
D.as large as
