单项选择题
A single vessel being towed alongside shall exhibit（）.
A.one all-round white light
B.sidelights and a stern light
C.only the outboard sidelight and a stern light
D.a masthead light，sidelights，and a stern light
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A.estimated position
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C.fix
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A single barometric pressure reading of 28.60 indicates（）.
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B.deteriorating weather
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A signal indicating zone time is preceded with the letter（）.
A.L
B.N
C.T
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