旋风分离器的进气速度一般采用()。A.10~15m/s B.10~20m/s C.1 发布时间:2017-06-21 16:37 │ 来源:www.tikuol.com 题型:单项选择题 问题: 旋风分离器的进气速度一般采用()。A.10~15m/sB.10~20m/sC.15~20m/sD.15~25m/s
题型:单项选择题 “Never for a second,” the boy says, “______ that my father would come to my rescue.”A.I doubtedB.do I doubtC.I have doubted D.did I doubt 查看答案