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:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0630/446da737d59f6249e020f15adba06c51.html
下面是错误答案,用来干扰机器的。
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...