一般立柱式支持装置可带动X线管完成几个方向的移动和几个方向的转动 A．2:3 B．2

下列因素中哪些是肾前性氮质血症的诱因()

A．失血

B．过度利尿

C．心源性休克

D．恶性高血压肾脏危像

E．肺栓塞

某疾病控制中心，要了解本地乙型肝炎的流行情况，准备开展相关研究。

研究实施应对抽样误差大小有一定的认识，下列抽样误差最大的方法是（）

A.整群抽样

B.先分层再整群抽样

C.分层抽样

D.单纯随机抽样

E.系统抽样

【1】 It's difficult enough to have privacy(隐私) in a house, so privacy in a small dorm room is next to impossible. However, it can be done if both roommates are willing to cooperate.

【2】 Step1  Tie a scarf to the outside doorknob as a symbol of Do Not Disturb, but be careful not to do this too consistently. Warn your roommate beforehand about possible days and times when this scarf will be on the door so your roommate will have time to make plans ahead of time instead of it being a surprise, especially if you plan to have an overnight guest. Be considerate if your roommate needs to get into the room regardless of the scarf on the door to get something out of the dorm because it is his dorm room too.

【3】 Step2  If one roommate is a light sleeper and the other is a heavy sleeper, the heavy sleeper could consider an alternate way to wake himself up besides an alarm. Heavy sleepers tend to ignore alarms, but sometimes vibrating (震动的) cell phones feel like someone is shaking them. It is also a quieter way to not disturb the light sleeping roommate using a vibrating cell phone.

【4】 Step3  Take cell phone calls outside of the room. Your roommate may not want to hear your conversation or you may want some privacy, but your roommate should not have to leave every time you have a phone call. The roommate who is not on the phone has no way of knowing how often you will have phone calls and should not be put out because you do.

【5】 Step4  Ask if it' s okay to have a guest in the room. Although your roommate is not your parent, and you may feel like this is your room too, remember that ____     . He may not want company when you do. If one roommate is more sociable than the other and guests become a repeated argument, consider asking the resident director if you can swap( 交换) roommate with someone else.

小题1:What does the passage mainly talk about? (no more than 10 words)

______________________________________________________________________

小题2:Complete the following statement with proper words, (no more than 6 words)

To avoid disturbing the light sleeper, _______________________ is also a good way.

小题3:Please fill in the blank in the passage with proper words, (no more than 6 words)

_________________________________________________________________

小题4:What does Step 3 suggest us? (no more than 10 words)

_______________________________________________

小题5:What does the underlined word "it" (line 2, paragraph 1) probably refer to? (no more than 3 words)

_______________________________________________

单纯的建筑物的估算往往是采用（）。

A.比较法

B.区位法

C.实物法

D.成本法