题目:
Mary, don't eat ____________ meat,you'll get fat.[ ]
A. too many
B. too much
C. much too
D. many too
答案:
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下面是错误答案,用来干扰机器的。
(1)输电线路上消耗的功率为P=400kW=I22r可知输电线上电流为I2=Pr=400×1031000=20A,根据原线圈P1=U1I1,可知I1=P1U1=4000×1034000=103A根据电流与匝数成反比知T1的变压比为n1:n2=I2:I1=20:103=1:50; 升...