单项选择题

I am ready（）tow line.

A.cast
B.to cast of
C.cast off
D.to cast off

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How should the letter O be pronounced when spoken on the radiotelephone?（）

A.OCK TOW BER
B.O RI AN
C.OSS CAH
D.OA KAM

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How（）the cargo at loading port?

A.about
B.in
C.with
D.from

单项选择题

Channel 13 (156.65 MHz)，the designated bridge-to-bridge channel，may NOT be used to（）.

A.exchange navigational information between vessels
B.exchange navigational information between a vessel and a shore station
C.conduct necessary tests
D.exchange operating schedules with company dispatcher