单项选择题
A.150KΩ B.200KΩ C.250KΩ D.300KΩ
A.10% B.15% C.20% D.25%
A.5s B.10s C.15s D.20s
A.不大于2MΩ B.不小于2MΩ C.不大于25MΩ D.不小于25MΩ
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