小明用平面镜将一束太阳光反射到竖井中（如图所示），请在图上作出平面镜的位置，并标

分解因式：-x³+2x²-3x=______．

在推进城乡一体化进程中，成都市锦江区三圣乡红砂村积极探索土地承包经营权流转新机制，建立起“股份+合作”的土地流转路子和“底金+分红+劳务收入”的土地流转分配方式，即由农民自愿将土地承包权集中起来，请有实力的种植公司来盘活土地，农民则以土地“入股分红”并进入种植公司务工，实行土地股份合作有利于 

①实现规模化、集约化经营，发展现代农业

②优化土地资源配置，提高农业的综合效益

③实现农民收入来源多元化，增加农民收入

④充分保障农民的土地所有权和经营权收益

A．①②③

B．②③④

C．①②④

D．①③④

E

COURSE: Introduction to American History

INSTRUCTOR: Dr Jane Klammer

OFFICE: 305 Marshall Hall

OFFICE HOURS: 11: 15~12: 30 M W F (Monday Wednesday Friday)

CLASS: 363 Marshall Hall 3: 35~5: 00 T Th (Tuesday Thursday); 10: 10~ 11: 00 M W F; Other time by appointment

TELEPHONE: 255 4786

TEXTBOOK: The American Tradition: A History of the United States (written by Green& Robert. Published by Ohio State University Press, 1973), which is bought at the College Bookstore.

Attendance is not required, but you are responsible for all the information given in the class lectures. In the lectures I will talk about the chapters in the textbook and other materials that I choose to add to the course. The exams will cover all this information. Therefore, I advise you to come to the class as much as possible. If you have to miss a class, be sure to get the class notes from another student.

Your homework assignments are listed on the next page. If there are any changes in the assigned homework reading, I will announce them in class.

You are supposed to read the chapter about which I will be lecturing before you come to class. This is to make sure that you understand as much as possible while taking notes in my lectures. Be prepared when you come to class.

The term paper is 40% of your final grade. It should not be more than fifteen pages(Another thinking of majoring in history may write twenty-five pages). Before the midterm exam you will choose the topic for your paper.

72. If a student wants to know what the homework assignments are, ______.

A. Prof. Klammer announces them in class

B. he（she）reads the list on the next page

C. Pro. Klammer gives a list every week in class

D. he（she）goes to the professor’s office

73. If a student cannot see Prof. Klammer during her office hours, he ______.

A. sees her after class               B. calls her at home

C. makes an appointment with her     D. asks another student

74. According to the passage, which of the following is probably TRUE?

A. The textbook is written by Dr Klammer.

B. If you have to miss a class, be sure to say sorry to Prof. Klammer.

C. The students can buy “Introduction to American History” at the College Bookstore.

D. Prof. Klammer encourages his students to take notes in her class.

75. It can be judged that ______.

A. before the final exam, you will choose the topic for you paper

B. the students who will take the course had better attend the lectures as much as possible

C. your term paper should be more than fifteen pages

D. you will have a class at 11:15~12:30 on Sunday

场景（七）某安装公司承接某燃气发电工程，安装公司项目部根据工程特点，编制了施工组织设计，方案中规定：1000m3液化气球罐焊接前应进行预热，焊接工作全部完成后进行整体热处理，最后进行充水试验；设备安装中对每组垫铁的数量和调整方法作了规定；对燃气轮机刚性联轴器同轴度用百分表进行测量；主蒸汽管道完成后用蒸汽吹扫。　　根据场景（七），回答下列问题：

燃气轮机刚性联轴器的类型有（　）。

A．凸缘式

B．套筒式

C．摩擦式

D．啮合式

E．夹壳式

烧伤休克的主要原因（）

A.患者烧伤时体液蒸发

B.大量红细胞丧失

C.大量体液从血管中渗出

D.疼痛

E.创面感染