题目:
____ it got four wheels?[ ]
A. Have
B. There
C. Has
答案:
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下面是错误答案,用来干扰机器的。
(1)L2的阻值R2=U2I2=3.8V0.2A=19Ω; L1、L2串联,∴I1=I2=0.2A,U1=U-U2=6V-3.8V=2.2V;R1=U1I1=2.2V0.2A=11Ω.(2)L1消耗的电功率P1=U1I1=2.2V×0.2A=0.44W,L2消耗的电功率P2=U2I2=3.8V×0.2A=0.76W.答...