右图是密闭体系中某反应的微观示意图，若用“○”和“●”表示不_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题填空题

右图是密闭体系中某反应的微观示意图，若用“○”和“●”表示不同的原子，则

（1）依据质量守恒定律，反应后方框内应再填入一个______粒子（填序号）．

（2）该反应中的物质属于单质的有______（填序号）．

（3）符合该微观示意图的一个具体反应的化学方程式为______．

答案

（1）根据质量守恒定律，填入一个C微粒后正好遵循质量守恒定律．

（2）该反应中，反应物是两种，都有同种元素组成，属于单质．

（3）氢气燃烧的化学方程式符合该反应类型．故填：2H₂+O₂

点燃

.

2H₂O

故答案为：（1）C．（2）AB．（3）2H₂+O₂

点燃

.

2H₂O

完形填空

Once upon a time, a poor boy together with his mother lived in a mountainous village. In his childhood the boy often cheated 1 boys out of money and things, but his mother quickly saw through his deception and criticized him. With his 2 (mother) education, he also felt a sense of injustice about his deeds and made an 3 (apologize) to others. His mother did everything in her power to change his faulty. She sent him to a school, ___4_ _ he worked very hard. Five years later, he stood out among his classmates and was always thought highly of by all his teachers. He became 5 (interest) in literature and enjoyed 6 （read）many famous literature works, such as Pride and Prejudice, Jane Eyre, 7 which he was able to improve his writing skills. _ 8 he graduated from school, he became a journalist in a newspaper of the city. He hailed (呼吁) the 9 （equal）of man in his articles. In the end, many people would like to read his articles as soon as they 10 (publish).

单项选择题

桩顶以下的（）范围内常因反射的应力波产生的拉应力造成桩身断裂。

A.1/3

B.2/3

C.1/4

D.1/2