According to Krom,the Egypt’s o1d Kingdom fell
A immediately after a period of drought.
B immediately after a period of flood.
C just before a drought struck.
D just before a flood struck.
第4题
A.INMARSAT船站
B.VHF/DSC或MF/DSC
C.SART及VHF DSC
D.S-EPIRB及VHF/DSC
第7题
VHF设备中,使用DSC终端,其字符中码元速率为_____。
A.100Bd
B.600Bd
C.1200Bd
D.2400Bd
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