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單項選擇題

Before（）, a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.

A.transmit
B.to transmitting
C.transmitting
D.in transmitting

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單項選擇題

Two vessels（）while they „re sailing in Huangpu River.

A.strike
B.strikes
C.are striking
D.struck

單項選擇題

（）all ships in a large sea area being alerted, an “area call” will normally be transmitted so that only those ships in the vicinity of the distress incident are alerted.

A.Avoiding
B.To be avoided
C.Avoided
D.To avoid

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