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单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.A set the relief valveB check the lubrication systemC vent the pump casingD open the pump suction and discharge valves

题目
单选题
All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.
A

set the relief valve

B

check the lubrication system

C

vent the pump casing

D

open the pump suction and discharge valves

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