问题
单项选择题
International Navtex service is（）.
A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system
答案
参考答案：A
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International Navtex service is（）.
A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system
参考答案：A