试题与答案

Mrs. White has _______ that she is not a

题型:选择题

题目:

Mrs. White has _______ that she is not able to get a job. [ ]

A. so little education

B. such little education

C. so a little education

D. such a little education

答案:

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50 W题目分析:设原线圈上所加电压为U1,匝数为n1,副线圈上两端电压为U2,匝数为n2,有①副线圈两端通过导线向用户供电,设用户电压为U3,导线上的电压降为ΔU,有U2=U3+ΔU②导线上损失功率为P=③由①②③...

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