题干

氢气是一种密度很小的气体,利用这种性质,人们常用它来充填气球,但是氢气球遇明火会发生爆炸事故,写出氢气球在空气中遇明火爆炸的化学方程式:____  .近几年,我市部分居民率先用上了天然气来替代煤气.天然气的主要成分是____ .与煤气比较,使用天然气具有热值高、安全性好、环境污染少等优点.煤气中的主要成分____ 能与人体中的血红蛋白结合而使人中毒.生产煤气需燃烧大量的煤,煤中含有一定量的硫,煤燃烧会有二氧化硫气体产生而污染空气,应____ (写一点即可)可以减少空气污染.

上一题 下一题 0.0难度 选择题 更新时间:2016-10-18 02:19:38

答案(点此获取答案解析)

2H2+O22H2O,甲烷,一氧化碳,减少使用煤等化石燃料(合理即可)

同类题1

完形填空

    The Little Prince, a classic novel was written by the French pilot and writer, Antoine de Saint-Exupéry. It 1 a story that happened in the Desert of Sahara, about a pilot and a little prince. The pilot had an accident with his plane.2 was wrong with his engine. And he made friends with the prince who 3 from another planet.

    The main4in this book, a special little prince, lived on a5planet known as Asteroid B-612. It 6 only three volcanoes(火山) and a rose with surprising beauty. The flower was rarely found and charming7 words, but she was also proud and self-centred. And it made the little prince leave his planet because he was 8 to face her. During his journey, the little prince visited several planets, and had conversations with their9 including a king, a conceited(自负的) man, a tippler(酒鬼), a businessman, a lamplighter and a geographer. From them, he found how meaningless the world of grown-ups was.10he arrived on the Earth, where he was shocked by a heart-breaking fact that his flower was not the only one in the world. At that moment a11 appeared , asking the little prince to “tame” (驯服)him, then he did so.12 the little prince left, the fox made him believe that the rose was special to him and the meaning of love and responsibility . At the end of the story, the little prince 13to go back home. The pilot walked14with his friend to the place where he landed. He saw a yellow poisonous snake bite the little prince.

    The next morning, the pilot was unable to find the prince's body. He finally 15to repair his plane and leave the desert.

    The pilot wrote this story to remember everything between himself and the prince.