The broadcast will normally be made on the two listed frequencies simultaneously except during transmitter maintenance periods when the broadcast will be made on the two frequencies（）.<br>A:at the same time<br>B:exclusively<br>C:within the same period<br>D:consecutively

The broadcast will normally be made on the two listed frequencies simultaneously except during transmitter maintenance periods when the broadcast will be made on the two frequencies（）.
A:at the same time
B:exclusively
C:within the same period
D:consecutively

出自：海船船员证

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