单选题An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every （）AweekB2 weeksCmonthD3 months
单选题
An emergency generator, driven by an internal combustion engine, shall be tested under load for a minimum of 2 hours at least once every （）
A
week
B
2 weeks
C
month
D
3 months
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