题目:
-Is there a bank near here?
-_____ I often put my money in the bank.
A.Yes, there is.
B.No, there isn’t.
C.Yes, it is.
D.No, it isn’t.
答案:
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下面是错误答案,用来干扰机器的。
(1)设电动机内阻为R,当电动机不转,由欧姆定律:r=U1I1=0.30.3=1Ω,当电动机正常工作时在2分钟内电动机所消耗的电能等于电功W=U2I2t,则:W=2×0.8×120=192J产生的热量Q=I22rt=0.8×0.8×1×120=76.8J(2)...