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To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().
A. shaft and impeller
B. motor and pump shaft
C. casing and impeller wearing rings
D. lantern ring and impeller
进入改、扩建工程运行区域的交通通道应设置安全标志,车辆(包括装载物)外廊至无围栏±500kV带电部分之间的安全距离应不小于()米。
A. 5.45
B. 5.6
C. 8
D. 9