变压器是将一种交流电转换成另一种()的静止设备。A.直流电 B.交流电 C.大电流 发布时间:2020-01-05 21:01 │ 来源:www.tikuol.com 题型:单项选择题 问题: 变压器是将一种交流电转换成另一种()的静止设备。A.直流电B.交流电C.大电流D.小电流
题型:单项选择题 His mother repeated telling him that he should work hard, but _____ didn't help. [ ]A. he B. which C. sheD. it 查看答案