若NA表示阿伏加德罗常数的值，下列说法正确的是（） A．0.1mo_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

若N_A表示阿伏加德罗常数的值，下列说法正确的是（）

A．0.1molNa₂O₂中含有的离子数为0.4N_A

B．利用氧化还原反应原理制取1mol氧气，转移的电子数一定为4N_A

C．7.1g氯气与足量NaOH溶液反应电子转移数为0.2N_A

D．标准状况下，和混合气体中含有的原子数是

答案

答案：D

0.1molNa₂O₂中含有0.2N_ANa⁺、0.1N_A O₂^2-；若利用H₂O₂制取1mol氧气，转移的电子数一定为2N_A；C项电子转移数为0.1N_A；每个CO₂，O₃均含3个原子则标准状况下，11.2L和O₃和混合气体中含有的原子数是1.5N_A. D正确。

阅读理解

根据2011年人教版高一英语课时典中点第二单元自主预习案(必修1)完成下面表格

Time	How is English developed?
1. Between about ________450 and 1150	2. Spoken in English and ______ more on German.
Between about AD 800 and 1150	3.________and French enriched the English_______ and especially its_______
At the end of the 16th century	4. About five to seven______ people spoke English.
In the 17th century	5. Used by more people as a result of the _______to conquer other parts of the world.
Later in the 18th century	6. Began to be spoken in_______ and_______.
By the 19th century	7._______by two dictionaries
Now	8. Spoken in countries such as China, ______, ________ , ________and____________ as a foreign or second language.
9.In a word,English is ____and _____ over time and is spoken______the world.

多项选择题

零售业务经办的主要职责（）

A.对外提供优质文明服务工

B.对外提供人民币大小额兑换、残损币兑换

C.每日“三碰库”

D.按要求记载有关登记簿等辅助账务