下列实验操作中,正确的是()A.品尝一下一种白色晶体是否是食盐 B.将鼻孔凑到瓶口闻

题型:单项选择题

问题:

下列实验操作中,正确的是()

A.品尝一下一种白色晶体是否是食盐

B.将鼻孔凑到瓶口闻一下瓶内的液体是否是醋

C.用手拾起掉在地上的药品放回原瓶

D.用完的药瓶将盖盖好放回原处

考点:高校实验室安全考试化学化学题库
题型:单项选择题

阅读理解。

E-mail: Party From: 11350@csu.edu (Lisa Raster)

To : jennysmith@ yahoo.com (Jenny Smith)

Subject: Party!!!

        Hi Jenny. Listen, I'm having a party this Friday at my house. Just a few friends will be there.

Mostly they 're from the office. My boyfriend Tom will also come. He's a nice guy. I want you

to meet him.

       Do you want to come? We 'll play games and talk. Then we'll eat dinner. Everybody will bring

food or drinks. The party is this Friday. It starts at 4:00 PM. It will end at 8 or 9 PM.

       We'l1 have a great time! Can you come? I hope so! Let me know soon. Call me or send me

an e-mail.

1. "Mostly they're friends from the office." What does"friends from the office" mean?

A. Lisa's co-workers.

B. Living at the company.

C. Tom's co--workers.

2. They will eat _______ at the party.

A. breakfast

B. lunch

C. dinner

3. Who will not go to the party?

A. All Of Jenny's friends.

B. Somebody's boyfriend.

C. Lisa's friends.

4. What is true about the party?

A. Many people will go.

B. It will last four or five hours.

C. It's on the weekend.

5. What will Jenny do first?

A. Buy food for the party.

B. Call Tom.

C. Send an e-mall to Lisa.

题型:单项选择题

当电除尘器长时间停运,应每天开启依次阴、阳极振打机构。()

题型:单项选择题

观察下列算式:

1+3=4=22

1+3+5=9=32

1+3+5+7=16=42

1+3+5+7+9=25=52

你能得出怎样的结论?

题型:单项选择题

旅客退票实际上是向铁路运输企业提出______的请求;旅客要求办理改乘手续,实际上是向铁路运输企业提出______的请求。

题型:单项选择题

带电作业时,也可进入带电间隔。()

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