三相半波可控整流电路,当α=0时,直流输出电压平均值为整流变压器副边相电压值U2的( 发布时间:2017-04-30 01:50 │ 来源:www.tikuol.com 题型:单项选择题 问题: 三相半波可控整流电路,当α=0时,直流输出电压平均值为整流变压器副边相电压值U2的()倍。A.1.0B.C.1.17D.2.34
题型:单项选择题 用所给词的适当形式填空。1. Today we are _________ (put) up the Christmas tree. 2. Yesterday we _________ (buy) gifts. 3. Would you like to help _________ (we) put up our Christmas tree? 4. This is a little pair of _________ (skate). 5. These are two toy _________ (snowman). 查看答案