單項(xiàng)選擇題

You have anchored in the wrong position obstructing other traffic. You must（）.

A.pick up your anchor
B.heave up your anchor
C.keep radio be silent
D.drag your anchor

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單項(xiàng)選擇題

You must（）in this area unless you have messages about the casualty.

A.keep radio silence
B.keep radio silent
C.keep radio be silent
D.keep silent the radio

單項(xiàng)選擇題

You shall（）this letter so as to signify your acknowledgement of the responsibility.

A.make out
B.submit
C.produce
D.endorse