All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.<br>A:set the relief valve<br>B:check the lubrication system<br>C:vent the pump casing<br>D:open the pump suction and discharge valves

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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