跨度大于10M的桥式和门式起重机的轨道跨度的极限偏差最大不得超过（）mm。
A.±20
B.±18
C.±15
D.±12
参考答案：C
Though I wasn't there that day, I was____ to find out what he said. [ ]
A. strange
B. nervous
C. curious
D. conscious
供电服务“十项承诺”对故障抢修时限是怎样规定的？
