A.100~10mm
B.10~1mm
C.100~10kmm
D.10~1kmm
[单选题]移动通信使用的极低频的波段范围是()。A .100~10mmB .10~1mmC .100~10kmmD .10~1kmm
[单选题]移动通信使用的极低频频段的频率范围为()。A .3~30HzB .30~300HzC .300~3000HzD .3~30kHz
[单选题]移动通信使用的极低频频段的频率范围为( )。A.3~30HzB.30~300HzC.300~3000HzD.3~30kHz
[单选题]目前移动通信使用超低频的频率范围是()。A .3~30HzB .30~300HzC .300~3000HzD .3000~30000Hz
[单选题]目前移动通信使用超低频的频率范围是()。A.3~30HzB.30~300HzC.300~3000HzD.3000~30000Hz
[单选题]目前移动通信使用超低频的频率范围是()。A.3~30HzB.30~300HzC.300~3000HzD.3000~30000Hz
[单选题]移动通信使用的短波的波长范围是()。A .10~1km(104~103m)B .1000~100m(103~102m)C .100~10m(102~10m)D .10~1m
[单选题]移动通信使用的短波的波长范围是( )。A.10~1km(104~103m)B.1000~100m(103~102m)C.100~10m(102~10m)D.10~1m
[单选题]移动通信使用的甚长波的波长范围是()。A .100~10Mm(108~107m)B .10~1Mm(107~106m)C .1000~1000kMm(106~105m)D .100~10kMm(105~104m)
[单选题]移动通信使用的甚长波的波长范围是( )。A.100~10Mm(108~107m)B.10~1Mm(107~106m)C.1000~1000kMm(106~105m)D.100~10kMm(105~104m)