使用了较低辛烷值的汽油时,则需()。A.降低混合比 B.使点火时间提前 C.使点火时 发布时间:2017-09-28 17:27 │ 来源:www.tikuol.com 题型:单项选择题 问题: 使用了较低辛烷值的汽油时,则需()。A.降低混合比B.使点火时间提前C.使点火时间延后D.提高混合比
题型:单项选择题 Now the air in our hometown is even than it was before. So we must do something to stop it. [ ]A. dirty B. better C. worse D. dirtiest 查看答案