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[单选] 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

井筒状况属于()。 井下作业资料。 地质资料。 工程资料。 动态资料。 简述砖砌条形基础的组成。 双馈式异步发电机运行模式有()。 同步。 亚同步。 超同步。 不同步。 双钥加密算法的特点是加、解密速度快。 Expenditure incurred by the parties to the adventure on account of salvage,whether undercontract or otherwise,shall be allowed in general average to the extent()the salvage operations were undertaken for the purpose of preserving from peril the property involved in the common maritime adventure. where。 which。 whether。 that。 To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the ().
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