测量电力变压器绕组的绝缘电阻应使用2500V或5000V绝缘电阻表进行测量。
参考答案：对
Though _____ to see us, the professor gave us a warm welcome. [ ]
A. surprising
B. was surprised
C. surprised
D. being surprised
具有话务集中（扩散）功能的接口模块是在（）
A.模拟中继
B.数字中继
C.用户级用户模块
D.信号设备
