胶带斗提有哪四种保护（）。

发现无风、微风或瓦斯超限等重大隐患时，断电、撤人及汇报的顺序是（）

A、先撤人、后断电汇报

B、先断电、后撤人汇报

C、先汇报、后断电撤人

某同学设计右图所示的实验装置,进行一氧化碳还原氧化铜的实验。试回答：

(l)该装置存在的一个主要问题是               ，你的改进方法是                      。

（2）实验过程中,图中A处能观察到的实验现象是                        ；

发生反应的化学方程式为                               。

B处观察到的实验现象是                             ；

反应的化学方程式是：                                        。

With their weakening bodies, advanced age or increasing pressure of work or study, people have been advised and usually persuaded to have health care products. Do you remember your first time to take a nutritional supplement(营养补充品)? What was your first impression? 

Posted by Amy, Dec. 23, 2010 8:05 PM

Madeline on Dec. 24, 2010 7:25 PM

Years ago, as a young mom with two small children, I struggled to keep up with the demands of a busy life. One day, I woke up feeling so tired that I knew something had to change!

A friend gave me some Royal Jelly—an amazing substance(物质)from the beehive(蜂房). I was doubtful, but desperate…so I tried it! In time, I began to experience renewed energy and vitality(活力)like never before! Now, over two decades later, I travel all round the country, sharing my life-changing experience. I’m grateful for the energy to keep up and love to share this wonderful discovery with others.

Blanca on Dec. 25, 2010 7:02 PM

Ten years ago, when I was 73, my mind wanted to be busy and useful, but my body didn’t. I became tired and lethargic(无精打采的). That’s when my daughter Madeline tried to persuade me to try her special Royal Jelly. It made such a dramatic(巨大的)difference in her life, so she was sure it could help me too! Hesitating for 2 days, I gave in. She was right! I no longer felt worn out. I had a new, youthful zest(热情)for life and I’ve been OK — thanks to Royal Jelly!

Lori on Dec. 25, 2010 10:27 PM

When my mom Madeline was introduced to Royal Jelly, it affected my life, too! Mom gave me some of her fantastic Royal Jelly. Boy, things did turn around! I had more energy and stamina(耐力)and was finally able to keep up with high school and, eventually, college activities. Today, I’m a busy mom in my mid-thirties with two active boys and a new business! I have enough energy to do it all! I’m glad I took my Mom’s advice.

小题1:.

.From the text, we learn that ________________.        .

A．Madeline became more than willing to take Royal Jelly at the very beginning

B．Lori was grateful partly because Royal Jelly helped him to improve his studies

C．Royal Jelly is a product that can help renew a person’s energy and vitality

D．Amy has benefited from Royal Jelly so she posted a topic about the product小题2:.

Which of the following is true of Blanca?

A．She replied to the topic on Christmas Eve.

B．She tried Royal Jelly without hesitation.

C．She is now supposed to be in her seventies.

D．She was the second one to reply to the topic.小题3:.

. What’s the relationship between the Royal Jelly takers?

A．Lori and Blanca are Madeline’s grandchildren.

B．Madeline is Blanca’s daughter and Lori’s mother.

C．Blanca is Lori and Madeline’s great grandmother.

D．They have no blood relationship but friendship.小题4:.

Where can we most probably read this text?

A．In a sports club.

B．On an Internet page.

C．In a fiction.

D．In a travel magazine.

氨茶碱的有效浓度（）

A.5~10μg/ml

B.10~20μg/ml

C.20~25μg/ml

D.25~30μg/ml

E.30~35μg/ml

多股铝导线与铜导体连接，常采用DL系列接线端子。