单选题All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.Aset the relief valveBcheck the lubrication systemCvent the pump casingDopen the pump suction and discharge valves
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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