建筑管道安装的要求是（）
A.先给水，后排水
B.先排水，后给水
C.先管径外侧，后管径内侧
D.先管径内侧，后管径外侧
E.管件的规格适当比管道大一点，方便安装
参考答案：B, D
解析：建筑管道施工部分技术要点：（1）管道施工前应进行仔细审图，提前发现问题，尤其是高层、超高层建筑管井内垂直管道配管前，应进行实地测量，避免累计误差造成各层标高超差。（2）安装原则是先排水，后给水，先管井内侧，后管井外侧。管道应合理地分段并进行纵向固定，必要处应设置膨胀节。（3）建筑给水管道必须采用与管材相适应的管件。生活给水系统所涉及的材料必须达到饮用水卫生标准。给水系统管材应采用合格的给水铸铁管、镀锌钢管、给水塑料管、复合管、铜管、不锈钢管等。
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| The winter skies are grey and it's cold outside. The nights come early and we spend a lot more time 1 and alone. Many people 2 winter: so cold, so dark, so boring. But I like winter because I have more time to read. For many students reading means school; it means 3 . Reading is something your teacher assigns and it's something you're 4 . Reading is something you have to do, not something you want to do. But for me and many other people, reading is the most 5 thing we can imagine. Getting lost in a good book can 6 a cold winter evening disappear. Dull grey skies are no 7 for the fantastic adventures of Frodo in The Lord of the Rings《指环王》,or for romantic trouble-making of Jane Austen's Emma《爱玛》, or for the youthful problems of Holden Caulfield in The Catcher in the Rye《麦田守望者》. All of those books are studied in North American high schools. They are interesting and well written books that 8 young people. 9 . even there, many high school students don't enjoy reading the books because they are 10 their school work: "Oh, my God! Two hundred pages! I'll never be able to read 11 much." But sometimes a funny thing happens. They begin to read and they begin to follow the 12 .Suddenly, the world inside the book becomes more exciting and more wonderful than the world they 13 . At the moment the thought 14 reading is work disappears and reading becomes 15 . Reading anything is 16 but reading good books is a terrific way to improve your English. Good writers write English very well and 17 you with good examples to follow. And good books will tell you more about English 18 : what people think, how they talk, how they interact with each other. But don't let me 19 it by telling you that reading is good for you. Just think of it as a good way to 20 on a cold winter evening. | ||||
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