矿井主排水系统工作水泵的能力,应当能在20h内排出矿井()的正常涌水量(包括充填水及其他用水)。
A.20h
B.24h
C.36h
D.48h
参考答案:B
Standing on the top of the hill, one would not do anything, but _____ the flowing of the clouds around me.
A.enjoy
B.enjoying
C.enjoyed
D.to enjoy
绘图题:画出热磁氧分析仪环行水平通道发送器原理图。