对220V单相供电的用户,供电电压允许偏差上限值为额定电压的()A.+5% B.+7 发布时间:2017-06-24 18:09 │ 来源:www.tikuol.com 题型:单项选择题 问题: 对220V单相供电的用户,供电电压允许偏差上限值为额定电压的()A.+5%B.+7%C.+10%D.-5%
题型:单项选择题 The book be Linda's. You see there's her name on it. [ ]A. must B. might C. can't D. need 查看答案