在山区(雪地)地质勘查,当在大于()的坡道或悬崖峭壁上作业时,应当使用有保险绳的安全带,保险绳一端应固定牢固。
A.20°
B.30°
C.40°
D.45°
参考答案:B
— Why would some workers in Foxcon die _____ continue working in the factory?
— Psychologists say they are under too much pressure. [ ]
A. better than
B. by accident
C. instead of
D. rather than
跌落式熔断器控制的变压器,在停电时应()。
A.通知用户将负载切除;
B.先拉开隔离刀闸;
C.先断开跌落式熔断器;
D.先拉开低压总开关。