单选题The operator of electrical motors should keep a constant check on the loads they carry because （）Alow loads necessitate frequent insulation cleaningBexceeding nameplate values shortens useful lifeCenergy is wasted if full loading is not utilizedDpower factor correction methods are load dependent
单选题
The operator of electrical motors should keep a constant check on the loads they carry because （）
A
low loads necessitate frequent insulation cleaning
B
exceeding nameplate values shortens useful life
C
energy is wasted if full loading is not utilized
D
power factor correction methods are load dependent
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