电阻R1、R2串联时总电阻为20欧,则并联时的总电阻为()A、一定小于5欧B、一定大于5欧小于10欧C、一定小于或等于5欧D、一定大于10欧
电阻R1、R2串联时总电阻为20欧,则并联时的总电阻为()
- A、一定小于5欧
- B、一定大于5欧小于10欧
- C、一定小于或等于5欧
- D、一定大于10欧
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