脱硅工序的主要任务是什么？

现有下列两组溶液：

第一组：0.1 mol·L^-1的醋酸和盐酸；

第二组：pH＝12的NaOH溶液和氨水。

某同学在实验室中做如下实验：

（1）将它们分别稀释成相同pH的溶液，比较第一组和第二组溶液稀释倍数的大小：

第一组_____________________________________________________；

第二组_____________________________________________________。

（2）将它们分别加水稀释相同倍数，比较第一组和第二组溶液pH的大小：

第一组_________________________________________________________；

第二组_________________________________________________________。

（3）分析实验结论，导致该结论的最根本原因是_________________________。

我国最早在南极建立的考察站是

A．长城站

B．黄河站

C．中山站

D．昆仑站

阅读理解。

     EENSGIVING in SPRING 2010

     Frequently Asked Questions

     What is TEENSGIVING?

     TEENSGIVING is an exciting event where hundreds of New York City teens gather together

annually for a remarkable day of community service. This year, TEENSGIVING in SRING 2010

participants will once again better New York City and impact thousands of lives!

     When is TEENSGIVING in SPRING2010?

     SUNDAY, APRIL 25, 2010

     Where is TEENSGIVING?                

     All over New York City. Everyone will meet at the 92nd Street Y (92nd and Lexington) at 9:00

AM for the event kick-off. Then, all TEENSGIVING volunteers will disperse across the city to work

with our partnering agencies where they will make a HUGE difference and have fun!

     Who participates in TEENSGIVING?

     Hundreds of teenagers from around the city. Teens come from the 92nd Street Y, various city

schools, youth groups, and organizations in the area. In addition, many adult volunteers (aged 21 and

older) will donate their time to TEENSGIVING in SPRING 2010.

     What projects do participants do at the agencies?

     Sample projects include painting park benches, planting gardens, visiting and playing with

underprivileged children, assembling craft kits for children in hospitals, assisting at animal shelters,

working at soup kitchens, delivering meals and celebrating with families at homeless shelters.  

     Do I get anything for participating in TEENSGIVING?

     Yes! Everybody benefits! Teen volunteers will receive *6 hours* of community service credit, good

towards honor society, high school graduation and college application requirements. Adult volunteers

will be "thanked" with a light breakfast, a gift certificate for their troubles, and the satisfaction of helping

our city's youth contribute to their community. In addition, all teen and adult volunteers will receive a

cool TEENSGIVING in SPRING 2010 T-shirt.

     This sounds awesome! How do I register for TEENSGIVING in SPRING2010? Interested teens

and/or adults should e-mail the TEENSGIVING Coordinator Josh Hyman at jhyman@92Y.org

(subjet:TEENSGIVING) to receive more information and to register for this fantastic event!

     **Teens can also contact their school's Community Service Advisor**

     TEENSGIVING is sponsored by the 92nd Street Y.

1. TEENSGIVING is an event which is held ______.

A. from time to time            

B. once every year

C. every two years              

D. twice a year

2. Teenagers may do all the following in the event EXCEPT ______.

A. watering flowers          

B. cooking

C. cleaning streets            

D. taking care of animals

3. An adult volunteer may get _____ for his time devoted to TEENSGIVING in SPRING 2010.

A. community service credit and a T-shirt

B. a high school certificate and a light breakfast

C. a T-shirt and a gift certificate

D. a gift certificate and community service credit

4. The writer's purpose in writing this passage is to _______.

A. inform readers of some frequently asked questions

B. introduce TEENSGIVING in SPRING 2010 to readers

C. encourage readers to ask more questions about TEENSGIVING

D. call on readers to participate in TEENSGIVING in SPRING 2010

一般情况下，确诊恶性淋巴瘤主要依靠什么（）。

A.临床表现

B.血象

C.骨髓检查

D.细胞化学染色

E.淋巴结活检

下列关于肝静脉的描述错误的是（）

A.肝静脉包括肝左、中、右静脉

B.肝静脉包括肝左、中、右静脉，肝右后静脉和尾状叶静脉

C.肝左、中、右静脉出肝处称为第二肝门

D.肝右后下静脉和尾状叶静脉出肝处称为第三肝门

E.第二和第三肝门是相互移行的