问题
单项选择题
All stations which receive a distress alert shall immediately cease（）.
A.any transmission
B.any harmful transmission
C.to use radiotelephone
D.using radiotelephone
答案
参考答案：A
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All stations which receive a distress alert shall immediately cease（）.
A.any transmission
B.any harmful transmission
C.to use radiotelephone
D.using radiotelephone
参考答案：A