《中华人民共和国劳动法》规定,国家()用人单位根据实际需要,为劳动者建立补充保险。
A.要求
B.强制
C.鼓励
D.希望
参考答案:C
He's got himself into a dangerous situation ____ he is likely to lose control over the plane. [ ]
A. where
B. which
C. what
D. why
继电保护装置直流电源丢失、电压断线信号或失去电压等,值班人员应立即进行哪些处理?