各齿轮、减速器要随时观察油位、油品而加油，原则上定期换（）。

在图示电路中，灯L₁、L₂的电阻分别为R₁、R₂，变阻器的最大电阻为R₀，若有电流通过，灯就发光，假设灯的电阻不变，当变阻器的滑片P由a端向b端移动时，灯L₁、L₂的亮度变化情况是（　　）

A．当R₂＞R₀时，L₁变暗，L₂变亮

B．当R₂＞R₀时，L₁先变暗后变亮，L₂先变亮后变暗

C．当R₂＜R₀时，L₁先变暗后变亮，L₂先变亮后变暗

D．当R₂＜R₀时，L₁先变暗后变亮，L₂不断变亮

Good afternoon, everybody. I’m pleased to be here with you, graduates of 2007. I’m a (1) , and students often approach me with (2) . You see, we are living in a society of great changes. With the presence of (3) , the process of getting a job in today’s world has changed for (4) .
Well, how can you use new technologies to help you First, let’s look at how you (5) . The traditional method of hunting for a job in the past required first, doing research on jobs that were (6) , typically by looking in newspapers, periodicals and magazines, as well as TV ads, and (7) . Then you decided where and for what post you were going to apply, put your resume (8) in a stamped envelope, and waited anxiously for someone to (9) .
Well, today, maybe the job search and (10) are very much the same, but the tools used are much more advanced, and they (11) . In fact, technology has not so much changed the process as enhanced it. The benefit, both for (12) , is that this makes the search more open to people of (13) from all over the world. But as more people are involved, it becomes (14) for the applicant than it ever was before.
The (15) for the working world today is learning these new and (16) and combining them with the older methods people have been using for years. For example, (17) , you can research employment not just in your city, but also in your state, your country, and (18) . You can copy information from a web page and paste it into a Microsoft Word document that’s easy to (19) . In many ways, it’s easier now: Just type your job application, click, and (20) ; it gets there in an instant.

如果在硬膜外注射试验量后，患者立刻主诉头昏、头痛、心慌。

其处理措施最应该是（）

A.立即放弃硬膜外麻醉

B.吸氧、给降压药

C.拔出导管改变间隙重新穿刺

D.后退导管少许至回抽无血

E.不用处理

起效最快，半衰期最短的强心苷（）

A.地高辛

B.洋地黄毒苷

C.米力农

D.多巴酚丁胺

E.毒毛花苷K

一般情况下，体重和胸围大的人、肺活量也大。