尾矿库企业要强化作业人员技能培训,加强尾矿库技术管理,每座尾矿库至少配备()名熟悉尾矿库相关业务的技术管理人员。
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Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals()
A. an injection process
B. an ejection process
C. a separation process
D. a heating proce
哪个不是地铁运输的特点()
A. 运量大
B. 速度快
C. 安全可靠
D. 无污染