某兴趣小组同学发现实验台上整齐摆放的药品中(如图所示),有一试剂瓶的标签受损.

题型:问答题

问题:

某兴趣小组同学发现实验台上整齐摆放的药品中(如图所示),有一试剂瓶的标签受损.

【提出问题】这瓶试剂的成分究竟是什么?

【讨论】根据受损标签及实验室药品分类摆放的原则,这瓶试剂不可能是______.A.酸;B.碱;C.盐.

【猜想】①可能是NaOH溶液;②可能是Na2CO3溶液;③可能______.

【设计并实验】

(1)小明用洁净干燥的玻璃棒蘸取该溶液到湿润的pH纸上,测得其pH=10,他判断这是一种碱性溶液.对他的操作方法、测量结果及结论的评价,正确的是______.

A.方法正确,结果准确,且结论正确.

B.方法正确,结果偏小,但结论正确.

C.方法不正确,结果偏大,但结论不正确.

D.方法正确,结果准确,但结论不正确.

(2)小明认为它是NaOH溶液,小俊认为它是Na2CO3溶液.要进一步确定它的成分,小俊认为只需选择如图所示已有的试剂就能鉴别出来.它们又进行了实验.

操作步骤实验现象结论及化学方程式
取样于试管中,__________________

考点:设计实验和科学探究酸、碱、盐氧化物酸碱指示剂物质的鉴别
题型:问答题

Most of the audience wondered what idea a man who’s deaf from birth can have _____ music.

A.with

B.in

C.of

D.at

题型:问答题

Some people make you feel comfortable when they are around. You spend an hour with them and feel as if you have known them half your life. These people have something in common. And once we know what it is, we can try to do it ourselves.

How is it done? Here are several skills that good talkers have. If you follow the skills, they’ll help you put people at their ease, and make friends with them quickly.

First of all, good talkers ask questions. Almost anyone, no matter how shy he is, will answer a question. One well-known businesswoman says, “At business lunches, I always ask people what they did that morning. It’s a common question, but it will get things going.” From there you can move on to other matters—sometimes to really personal questions. And how he answers will let you know how far you can go.

Second, once good talkers have asked questions, they listen to the answers. This point seems clear, but it isn’t. Your questions should have a point and help to tell what sort of person you are talking to. And to find out, you really have to listen carefully and attentively.

Real listening at least means some things. First it means not to change the subject of conversation. If someone sticks to one topic, you can take it as a fact that he’s really interested in it. Real listening also means not just listening to words, but to tones of voice. If the voice sounds dull, then, it’s time for you to change the subject.

Finally, good talkers know well how to deal with the occasion of parting. If you’re saying good-bye, you may give him a firm handshake and say, “I’ve really enjoyed meeting you.” If you want to see that person again, don’t keep it a secret. Let people know what you feel, and they may walk away feeling as if they’ve known you half their life.

小题1:Asking questions might be a quite good and suitable way _______.

A.for you to make more and more new friends

B.to begin your business talks

C.to get the conversation going smoothly

D.for you to make a deep and lasting impression on others小题2:After having asked somebody a question, it’ll be polite of you to _______.

A.make clear what kind of person he is

B.listen to his reply attentively

C.wait quietly and patiently for his answer

D.go on asking him more questions小题3:Generally speaking, good talkers are persons who _______.

A.are good at making any topic interesting

B.never talk too much or too little

C.always speak in a gentle way

D.know how and when they should change the topic of the talk小题4:If you really take delight in meeting someone again, _______.

A.you may take him as your lifelong trustworthy friend

B.it seems necessary for you to let him know it

C.it’s proper for you to give him a second handshake

D.it’ll be helpful for you to have further understanding of him

题型:问答题

属于兴奋剂目录所列的品种,并且药品零售企业可以经营的是()

A.阿片生物碱类止痛剂

B.利尿剂

C.抗肿瘤药物

D.蛋白同化制剂

题型:问答题

与灰口铸铁相比,球墨铸铁的机械性能有哪些特点?

题型:问答题

什么是记叙文的线索?记叙文的线索主要有哪些类别?试举例说明。

更多题库