单项选择题

Letter “H” means“（）”.

A. I have a pilot on board
B. I require a pilot
C. I have stopped
D. My vessel is healthy

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单项选择题

A. Man overboard
B. You are running into danger
C. My vessel is healthy.
D.I require a pilot.

单项选择题

A. heavy line
B. heaving line
C. head line
D. wire rope

单项选择题

A. gangway
B. ladder
C. pilot ladder
D. gangway combined with pilot ladder