单项选择题
By day，you sight a vessel displaying three shapes in a vertical line. The top and bottom shapes are balls，and the middle shape is a diamond. It could be a（）.
A.vessel trolling
B.mineclearing vessel
C.trawler
D.vessel engaged in replenishment at sea
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相关考题
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单项选择题
As a rule，ships of most configurations，when drifting in calm water with neglible current，will lie（）.
A.bow to the wind
B.beam to the wind
C.stern to the wind
D.with the wind on the quarter -
单项选择题
An inclined semisubmersible with a very short rolling period about a constant angle of list is likely to have（）.
A.an off-center TCG
B.an LCG greater than level vessel LCB
C.a negative GM
D.excessive free surfaces -
单项选择题
All of the following are engaged in fishing EXCEPT（）.
A.A vessel trawling
B.A vessel trolling
C.A vessel setting nets
D.A vessel tending lines
