生产过程中()和盲目蛮干往往是诱发事故的人为因素。
A.违章作业
B.事故隐患
C.危险因素
参考答案:A
It is difficult _______ the book in one day. It is so thick. [ ]
A. to finish to read
B. to finish reading
C. finishing reading
D. finishing to read
瓶组式细水雾系统备用状态下,储水容器处于()状态,储气容器处于()状态。
A.常压,高压
B.常压,低压
C.低压,常压
D.高压,常压