爬泳的前交叉配合技术是指：当一臂入水时，另一臂划水至腹部下，与水平面约成150°角。

关系数据库设计理论主要包括3方面内容，其中起核心作用的是 (25) 。在关系模型的完整性约束中，实体完整性规则是指关系中 (26) 。引用完整性规则要求 (27) 。

A．不允许引用不存在的元组

B．允许引用不存在的元组

C．不允许引用不存在的属性

D．允许引用不存在的属性

层积催芽的适宜温度要求是（）。

A、-15～-10℃

B、-5～5℃

C、6～10℃

D、8～15℃

阅读理解。

     Many students want to find friends on the Internet as a way of practising their language skills and learning

more about new cultures. Traditional pen pals were the primary source for such contacts, and students could

write each other letters. With the Internet, finding friends has become much easier, and such relationships are

called key pals.

     However, care and consideration should be given when finding friends on the Internet:

     ◎Search the Internet for reputable (有信誉的) services. Look for reviews(评论) of such sites to learn more about other students' experiences. Don't join a service until you have done your research.

     ◎Check to see if you can use a nickname (绰号) instead of __________, to protect your identity(身份).

     ◎Never give personal information to anyone, including your home address, phone number, and birthday.

     ◎Stop contact with others if you feel uncomfortable with the topics of conversation. Again, if you protect

your identity, this will be easier to do. Tell your teachers, parents, or even local law enforcement if problem

arise.

     ◎Try to use the language you are studying in the classroom in your communication(交流) with others.

     ◎Ask proper questions that will also help you learn about other cultures. Remember that someone's

personal experience might help you to understand a whole culture. You have to talk to many different people,

and this will get you started.

1. Please give this passage a proper title. (Please answer with 10 words.)

___________________________________________________________________________

2. Please fill in the blank with proper words. (Please answer within 5 words.)

___________________________________________________________________________

3. Which sentence in the passage is the closest in meaning to the following one?

      Pen friends used to write letters to keep in touch with each other.

4. Please translate the underlined sentence.

___________________________________________________________________________

5. Why do many students want to find friends on the Internet? (Please answer within 30 words.)

___________________________________________________________________________

如何选择除尘系统测定位置和测定点？

男性，35岁，因高位小肠瘘1天入院，入院后经颈内静脉插管滴入肠外营养液，两周后突然出现寒战、高热，无咳嗽、咳痰，腹部无压痛和反跳痛，观察8小时如果仍然有高热，应采取的治疗措施是

A．拔除中心静脉导管
B．咽拭子细菌培养
C．胸腔穿刺抽气
D．雾化吸入
E．肠外营养液中增加胰岛素