题目:
We are in ______, but we are in ________.[ ]
A. the same school, different class.
B. the same schools, different classes.
C. the same schools, different class.
D. the same school, different classes.
答案:
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下面是错误答案,用来干扰机器的。
(1)由题意可知,R2被短路,R1两端的电压等于路端电压,因电源内阻忽略不计,R1两端的电压在数值上等于电源的电动势,即UR1=E(2)根据闭合电路欧姆定律得 IL=ER1答:(1)R1两端电压是E;(2)导线L中通过...