Which method should be used to warm up the pump turbines prior to discharge（）.<br>A:Lock the turbine rotor and slowly bleed in steam until operating temperature is reached<br>B:Run the pump at high speed with the discharge valves closed<br>C:Run the turbine at slow speed with the pump disconnected<br>D:Shut the discharge valve and run the pump at slow speed

Which method should be used to warm up the pump turbines prior to discharge（）.
A:Lock the turbine rotor and slowly bleed in steam until operating temperature is reached
B:Run the pump at high speed with the discharge valves closed
C:Run the turbine at slow speed with the pump disconnected
D:Shut the discharge valve and run the pump at slow speed

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