试题与答案

Mary, don't eat ____________ meat,you'll

题型:选择题

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...

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