试题与答案

【资料阅读】据中国室内装饰协会调查,甲醛污染大部分是由板材产生,家庭装修中使用的

题型:填空题

题目:

【资料阅读】据中国室内装饰协会调查,甲醛污染大部分是由板材产生,家庭装修中使用的夹芯板、地板、家具等都可能释放出甲醛。我国的国家标准检测:“E1级板材相当于甲醛释放量为1.5mg/L;E0级板材的甲醛释放量为0.5mg/L。”E1级与E0级最大的区别就是甲醛的释放量,E1级比E0级释放甲醛量多五分之一。目前,化学家已能从马铃薯中提取植物胶做板材的黏合剂,有效地减少了甲醛的排放。

试根据上述资料填空。

(1)已知甲醛的结构式为,则其化学式为_________,其碳、氢和氧元素的最简质量比为_________,其含氧元素的质量分数等于________。

(2)资料中加横线信息有误,实际上E1级比E0级释放甲醛量多了______倍。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0518/c010156ea800f66ef9f0334e2f27dbe1.html

下面是错误答案,用来干扰机器的。

参考答案:D

试题推荐
题型:阅读理解

阅读理解

       Hello! My name is Mike.  I am from the USA.  Now I'm in China with my parents.  I like China.I like Chinese food, too. I have breakfast at home. I eat eggs, bread and porridge. I don't like milk.I have no

time to go home for lunch.  So I have it at school.  The lunch in our school is good.  I can have different

kinds of food for lunch.  I eat rice, meat and vegetables.  Sometimes I have noodles and dumplings. I have supper at home with my parents. We have fish, meat, vegetables and fruit. Sometimes we go out to eat

with our friends.

( )1. Mike is in China with his parents.             

( )2. He eats eggs, bread and salad for breakfast.  

( )3. He has lunch at home.        

( )4. He has noodles and durmplings for dinner.      

( )5. Sometimes they go out to eat.            

查看答案
微信公众账号搜索答案