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单选题
When it is advisable to remain on a VHF channel / frequency say
A
Stand by on VHF channel ... / frequency
B
Standing by on VHF channel ... / frequency
C
VHF channel .../ frequency ...is advisable
D
Advise(you) try VHF channel .. / frequency
答案解析
正确答案：A
相关知识点：
守某频道用Stand by表述
题目纠错
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