If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.<br>A:Skip zone<br>B:Blackout zone<br>C:Diffraction zone<br>D:Shadow zone

If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
A:Skip zone
B:Blackout zone
C:Diffraction zone
D:Shadow zone

出自：海船船员证

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