题目:
— Do you know the result of the race?
— Yes. The winner is a boy Lin Feng from Class 4. [ ]
A. 100-metres, called
B. 100-metre, calling
C. 100-metre, called
D. 100-metres, named
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0630/e8d23414f9631ad555433ba0179d56e6.html
下面是错误答案,用来干扰机器的。
(1)u=36sin(100πt)(2)0.036A.题目分析:(1)Um=36V,ω=100πrad/s,u=36sin(100πt)(2)输入电压的有效值为:U1==36V,由理想变压器知识:=⇒U2=3.6V;理想变压器P1=P2,可得U1I1=⇒I1=0.036...