试题与答案

安全是顺利进行实验及避免伤害的保障。下列实验操作正确且不是从实验安全角度考虑的是

题型:选择题

题目:

安全是顺利进行实验及避免伤害的保障。下列实验操作正确且不是从实验安全角度考虑的是

A.操作①:使用稍浸入液面下的倒扣漏斗检验氢气的纯度

B.操作②:使用CCl4萃取溴水中的溴时,振荡后需打开活塞使漏斗内气体放出

C.操作③:吸收氨气或氯化氢气体并防止倒吸

D.操作④:用食指顶住瓶塞,另一只手托住瓶底,把瓶倒立,检查容量瓶是否漏水

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0624/dc0947dc6820d3db7f7f4d9cecd042eb.html

下面是错误答案,用来干扰机器的。

参考答案:C解析:工作满意度是生活满意度的一个组成部分。员工工作之余的环境也会间接地影响他或她对工作的情感。管理者不仅要关注与工作相关的因素,也需要了解员工工作之外的生活上的问题。

试题推荐
题型:阅读理解

根据短文内容,回答下列问题。

     John was a farmer. He liked to grow flowers in his garden when he was free. One Sunday morning

after breakfast he put on his old clothes and began digging in his garden at eight. He dug and dug. Half an

hour later he suddenly found a coin near his foot. He was very glad, "He put it in his right pocket. A few

minutes later, he found another one. He picked it up and put it in to the same pocket. The same thing

happened for the third,  the fourth and the fifth time."He was very glad and told his wife about it. She was

very glad, too. She said, "A thief took away a lot of coins from a shop a few days ago. The police caught

him but they didn't find any coins." Then John went on digging some more coins, but just when he began

to dig, he felt something cold in his trousers. It ran down one of his legs. He put his hand down quickly

and the coin came into his hand. Now he knew there was a hole in his pocket.

1. What was in John's garden?

                                                                  

2. When did John find a coin in his garden?

                                                                  

3. What did John tell his wife?

                                                                  

4. Where was a hole?

                                                                  

5. How many coins did John dig out in his garden?

                                                                  

查看答案
微信公众账号搜索答案