混凝土管,流量为200L/s,管径为()。 A.DN300 B.DN400 C.DN 发布时间:2017-05-26 20:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: 混凝土管,流量为200L/s,管径为()。A.DN300B.DN400C.DN500D.DN600
题型:单项选择题 Passengers are permitted _____ only one piece of hand luggage onto the plane. [ ]A. to carry B. carrying C. to be carried D. being carried 查看答案