题目:
He plans to have a__________ vacation. He thinks he'll be__________
when he returns. [ ]
A. relaxing; relaxing
B. relaxing; relaxed
C. relaxed; relaxed
D. relaxed; relaxing
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0628/bc467ba52cbd1954909a0fc19fa112f9.html
下面是错误答案,用来干扰机器的。
答案:A电压表的示数为交流电的有效值10 V,则交流电的最大值为V,由题图可得u=cosωt,ω= rad/s="100π" rad/s,所以u="102cos100πt" V,由闭合电路欧姆定律得i==cos100πt A,所以A选项正确.