单选题:Whatwouldhappenifpeopledroprubbishinawrongplace?[A]Theywould 题目分类:公共英语二级 题目类型:单选题 查看权限:VIP 题目内容: Whatwouldhappenifpeopledroprubbishinawrongplace?[A]Theywouldbehappy.[B]Theywouldbefined.[C]Nothingwouldhappen. 参考答案: 答案解析:
燃气管道采用( )时,煤气管可选用厚自漆或聚四氟乙烯薄膜为填料,天然气或液化石油气管选用石油密封酯或聚四氟乙烯薄膜为填 燃气管道采用( )时,煤气管可选用厚自漆或聚四氟乙烯薄膜为填料,天然气或液化石油气管选用石油密封酯或聚四氟乙烯薄膜为填料。A.螺纹连接 B.承插连接 C.橡胶 分类:公共英语二级 题型:单选题 查看答案