Which channel is designated for VHF Digital Selective Calling?
A.Channel 70
B.Channel 06
C.Channel 13
D.Channel 16
A
上一篇 某水泵运行时进口压力为0.05Mpa,排出口压力为0.25Mpa,则水泵的压头为
下一篇 对于()的化学品在航行运输期间应冷却降温。
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