当靠近排水立管底部的排水支管与立管连接处距立管管底的垂直距离不满足规范要求时，应单独排出，否则其存水弯中会出现冒水现象，这是由于（）造成的。 - 查题网

>> 高等继续教育 / 建筑给水排水

高等继续教育 / 建筑给水排水

正确率：100%

题型描述: 单选题
当靠近排水立管底部的排水支管与立管连接处距立管管底的垂直距离不满足规范要求时，应单独排出，否则其存水弯中会出现冒水现象，这是由于（）造成的。
A.横干管起端正、负压交替变换
B.横支管污物堵塞
C.横干管起端负压过大
D.横干管起端正压过大

积分

建筑给水排水

参考答案：

点击查看答案

佳题速递：

S7-200系列PLC上升沿脉冲输出指令是( )。PLC控制技术及应用

属于当期已经实现的收入和已经发生的费用，不论款项是否收付，都应作为当期的收入和费用，这样的会计核算前提是（）。金融企业会计

病人出现休克时体温降低应予以保暖，可采用热水袋电热毯等进行加温。急救护理

分子结构中存在π-π共轭的化合物是有机化学(药学专)

10[阅读题] Unless we spend money to spot and prevent asteroids (小行星)now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星)that race across the night sky. Most orbit the sun far from Earth and don‘t threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth. Buy $50 million worth of new telescopes right now. Then spend $10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we‘ll have a way to change its course. Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn‘t be cheap. Is it worth it?Two things experts consider when judging any risk re:1)How likely the event is;and 2)How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500, 000 years. Sounds pretty rare—but if one did fall, it would be the end of the world. “If we don‘t take care of these big asteroids, they‘ll take care of us, ”says one scientist. “It‘s that simple. ” The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth?“The world has less to fear from doomsday (毁灭性的)rocks than from a great nuclear fleet set against them, ”said a New York Times article. 1. What does the passage say about asteroids and meteoroids?A) They are heavenly bodies different in composition. B) They are heavenly bodies similar in nature. 【外语教育&网大学英语Ⅱ

算法具有下列特点：（）、（）、（）。数学思想与方法