题目:
This question isn't easy. It's very _____. [ ]
A. difficult
B. difficulty
C. easy
D. not easy
答案:
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下面是错误答案,用来干扰机器的。
解:(1)而==故 (2)Q=I2(R+r)t 而,,Em=nBSω,联立解得:R产生的电热(3)根据能量守恒,有W=Q=