( )的目的是检验单机(或单元)设备和动力装置的安装质量是否可以正常启动运行。 A

有一单项式的系数是2009，含字母x、y，次数是4，请写出一个符合条件的单项式（    ）。

如下图，该螺旋测微器的读数为_________mm。

阅读理解。

     Mary Somerville was born in 1780 in Burntisland, Scotland. Her contribution to mathematics was in both

algebra (代数) and differential and integral calculus (微积分学).

     Mary was one of the world's first famous female mathematicians. She became interested in mathematics

and decided to study it at the time when it was considered unacceptable for a woman to do so. She bought

books on algebra and geometry and read them at night. In spite of disapproval from people around her, she

firmly went on with her struggle to learn. She won a prize for her solution to an algebra problem. She went

on to write several books on mathematics. Later in her life, she thought deeply about the years in which she

had persevered (坚持) almost without hope and said, "It taught me never to lose heart."

     Mary's way of learning remains useful today. If she worked for a while on a problem without coming up

with an idea, she stopped working and turned her attention to the piano, her needlework, or a walk outdoors.

She then returned to the problem with a fresh mind and a solution turned up. If she could not understand a

passage while reading, she would forget about it and read on; several pages later, the meaning of the puzzling

passage would become clear to her.

1. Why did Mary decide to study math?

A. Because she found math interesting and wanted to study it.

B. Because she was one of the world's first famous female mathematicians.

C. Because it was not considered acceptable for a woman to study math.

D. Because she was bored and had nothing to do.

2. What does the underlined word "disapproval" in Paragraph 2 mean in this text?

A. Disagreement.

B. Agreement.

C. Support.

D. Discovery.

3. What is the main idea of the third paragraph?

A. Mary could solve any difficult math problem easily.

B. Mary was, without doubt, a famous female mathematician.

C. Mary had some useful ways to deal with difficulties in her work.

D. Mary's ways to overcome difficulties were not effective.

4. According to the passage, if you have been puzzled by a math problem, you'd better ____.

A. keep working on it until it is solved

B. just forget about the problem

C. turn to your math teacher for help

D. listen to light music for a while and then continue working on it

法律援助机构的律师王某被指派帮困难户老李打一场关于赡养费的关系，最后由于证据不充分而被法庭宣布败诉，下列说法恰当的是()。

A.老李的官司费用由其个人支付

B.王某的办案补贴由法院支付

C.王某的办案补贴由法律援助机构支付

D.王某的官司败诉，根据规定他无权获得办案补贴

一般纳税人的下列各情形中，不得领购使用增值税专用发票的有（）。

A.会计核算不健全，不能准确核算进项税、销项税及应纳增值税的

B.销售的货物全部属于免税项目的

C.纳税人当月购买专用发票而未申报纳税的

D.当月进项税大于销项税，应纳税额为负数的