单选题The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.Aclosely observe the pump discharge temperatureBclose off the discharge valve, and watch for a rise in pressureCmomentarily close off the suction valve, and watch for a rise in pressureDuse a clamp on ammeter and compare the readings to past records
单选题
The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
A
closely observe the pump discharge temperature
B
close off the discharge valve, and watch for a rise in pressure
C
momentarily close off the suction valve, and watch for a rise in pressure
D
use a clamp on ammeter and compare the readings to past records
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