邮电费包括:()
A.上网费
B.电话安装费
C.通迅线路租赁费
D.传真设备安装使用费
参考答案:A, B, C, D
When the man was sent to the hospital, he had stopped . [ ]
A. breathing
B. breathe
C. to breathe
D. breathed
若被测机械的转向改变,则交流测速发电机的输出电压()。
A、频率改变
B、大小改变
C、相位改变180°
D、相位改变90°