已知一个串联电路(纯电阻性电路),其总电阻为20Ω,两端电压为100V,试求该电路中流过多大电流?
参考答案:根据欧姆定律:I=U/R计算
则:I=100/20=5A.
In salad bars the waiter does not bring you salad. You have to____ yourself, usually to as much as you want.
A.bring
B.serve
C.help
D.supply
地表水的主要危害有哪些?