关于MS在通话中的回声问题,下面哪个说法是正确的?()
A、回音抑制器出现故障
B、用户终端(MS)出现故障
C、传输交叉线
D、BTS硬件设备故障
参考答案:A, B, D
_________, he could continue working in this company now. [ ]
A. Had he not lied to the boss
B. Did he not lie to the boss
C. If he has not lied to the boss
D. If he didn't lie to the boss
B.输电线中的电流只由升压变压器原副线圈的匝数比决定
C.当用户用电器的总电阻减少时,输电线上损失的功率增大
D.升压变压器的输出电压等于降压变压器的输入电压