在表设计器的“字段”选项卡中可以创建的索引是A．惟一索引 B．候选索引 C．主索引

男性，45岁。肾移植术后第14天，移植肾功能正常，血肌酐110μmol/L，尿量2500ml/d。术后第15天，出现移植肾胀痛。查体：T37.5℃，P90次／分，BP150/90mmHg。移植肾肿大压痛明显，伤口引流管口处有大量淡黄色液体渗出。B超检查：移植肾周液性暗区，血流阻力指数0.70。

为鉴别伤口渗出液的性质，最简单可靠的方法是（）。

A.移植肾MRI检查

B.移植肾CT检查

C.泌尿系造影

D.膀胱亚甲蓝实验

E.移植肾放射性肾图检查

我市是第六个国家级“光谷”，下列过程属于物理变化的是（　　）

A．二氧化硅（SiO₂）与焦炭制粗硅（Si）

B．氢气与四氯化硅（SiCl₄）制纯硅（Si）

C．太阳能热水器中冷水变热水

D．在催化剂作用下太阳能光解水制氢

Have you ever got stuck with unwanted courses or a class schedule that cannot be changed? If so, that's because you don't know how to select the perfect sch

edule. But by following a few simple steps, you can begin any term with the right courses at the most convenient times.

First, you must find the right courses. These are the ones that have the least amount of work, the fewest tests and the kindest professors. Ask your friends about courses in which they received A's after attending only 70 percent of the classes. Ask around, too, to see which instructors have given the same tests for the last fifteen years. Photocopies of these tests are usually cheap and can be easily found in school. Then, pick up a copy of the master schedule and study it carefully. Find the course titles that mean an easy pass for a painless subject.

Look for titles like “Arts and Crafts for Beginners” and “Rock Music of the 1950s”.

Next, when you have got lists of easy instructors and subjects, you can begin to select your time periods. If you stay up late in order to watch old movies, you may want a daily schedule that begins no sooner than noon. You should schedule only afternoon courses, too, if you're one of those people who hate to leave a warm bed in the morning. On the other hand, if you are a person who gets out of bed at dawn, you may want to get your classes out of the way as early as possible. That way you have the rest of the day free. Morning classes are also necessary if you are a soap opera(肥皂剧) fan.

Finally, you want your schedule to pass through registration successfully. The main way to do this is to register(注册) early. If a course does happen to be closed because you simply couldn't register at 7:00 am, you may still be able to get in. Talk to the professor and tell him or her that a serious and hardworking student like yourself would be a shining example to other students. Be sure to carry a list of back-up courses to registration, though, just in case one of your chosen classes changes professors or time periods.

By following these suggestions, any student can pick the perfect class schedule. College can thus become an almost pleasant activity.

1.Which of the following statements is true?

A.You can get copies of tests if you are willing to pay the price.

B.“Rock Music of the 1950s” may be an easy course.

C.It is difficult to pick the perfect class schedule.

D.Attendance is required in all classes. 

2.You should  ________ .

A.register for classes in the morning if you get up early

B.have classes late in the morning if you stay up late

C.sign up for afternoon classes if you want to see soap operas 

D.choose classes in the evening if you want to watch old films 

3.If a course happens to be closed, you should  ________ .

A.register at 7:00 am               B.sit in on the class anyway

C.register for a back up course      D.get help from the professor 

4.Which of the following would be the best title for the passage?

A.Course Registration Made Easy         B.How to Find the Right Courses 

C.Classes and Afterclass Activities     D.How to Pick the Perfect Schedule

下列哪种药物属于兴奋性氨基酸受体拮抗剂（）

A.美金刚加

B.多奈哌齐

C.石杉碱甲

D.兰他敏

E.重酒石酸卡巴拉汀

当某段时间内的有功电量和无功电量相等时，其平均功率因数为（）。

A.0.80

B.0.71

C.0.67

D.0.50