单项选择题

All the copper bars are（）different sizes.

A.at
B.in
C.by
D.from

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单项选择题

A vessel transferring provisions or cargo at sea shall display during the day（）.

A.two black balls in a vertical line
B.three black balls in a vertical line
C.three shapes in a vertical line； the highest and lowest shall be red balls and the middle a white diamond
D.three black shapes in a vertical line； the highest and lowest shall be balls and the middle one a diamond

单项选择题

A vessel engaged in replenishment or transferring persons，provisions or cargo while under way can be regarded as（）.

A.a vessel restricted in her ability to maneuver
B.a vessel engaged in laying，serving or picking up a navigation mark，submarine cable or pipeline
C.a vessel not under command
D.a power-driven vessel