Before（）, a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.<br>A:transmit<br>B:to transmitting<br>C:transmitting<br>D:in transmitting

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

出自：海船船员证

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