燃气管道随桥梁敷设,过河架空的燃气管道向下弯曲时,宜采用()弯头A.30° B.45 发布时间:2017-02-26 21:05 │ 来源:www.tikuol.com 题型:单项选择题 问题: 燃气管道随桥梁敷设,过河架空的燃气管道向下弯曲时,宜采用()弯头A.30°B.45°C.60°D.90°
题型:单项选择题 In order to________a good knowledge of English,he gave up his job and went to Britain.[ ]A.require B.inquireC.acquire D.address 查看答案