UM71发送器电气特性测试标准是 ( )
A.A.电流电压：UA+，A-DC22.5-28.8V
B.B.载频F0+1.4Hz，F0+-1.3Hz
C.C.载频F0±1.5Hz
D.D.低频TBF±0.1Hz
正确答案是ACD
UM71发送器电气特性测试标准是 ( )
A.A.电流电压：UA+，A-DC22.5-28.8V
B.B.载频F0+1.4Hz，F0+-1.3Hz
C.C.载频F0±1.5Hz
D.D.低频TBF±0.1Hz
正确答案是ACD