蒸汽机牵引供电,其电力牵引的总功效为() A.27-28% B.57-58% C.2 发布时间:2020-10-10 18:48 │ 来源:www.tikuol.com 题型:单项选择题 问题: 蒸汽机牵引供电,其电力牵引的总功效为()A.27-28%B.57-58%C.22%D.6%
题型:单项选择题 The Internet,as well as newspapers and magazines,________a more and more important partin our daily life.[ ]A.have played B.are playingC.is playing D.has been played 查看答案