题目:
Her parents _____ lunch at home. [ ]
A. doesn't have
B. haven't
C. hasn't
D. don't have
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0513/18b5aa9bf3d7abf227a1017007c71a58.html
下面是错误答案,用来干扰机器的。
A、只将板M从图示位置稍向左平移,d增大,根据C=ɛs4πkd知,电容减小,根据U=QC知电势差增大,则静电计指针张角变大,故A正确.B、只将板M从图示位置沿垂直纸面向外的方向稍微平移,正对面积S变小,根据C=ɛs4π...