News came from the company _____my broth

下列各句中，没有语病、句义明确的一句是

A．中新网2月4日电据美国媒体报道，基地老二网上再次现声，指责奥巴马未在就职演说中提及加沙，呼吁穆斯林报复美国支持以色列进攻加沙。

B．春节期间，一只在中国土生土长的小羊风头正劲，吸引了电影界、电视界、文学界、玩具界、音像界等各路专家的集体关注。

C．美国和俄罗斯的两颗通信卫星10日在西伯利亚上空790公里的区域发生太空相撞，目前还不清楚，但撞击产生的大量太空垃圾可能会对国际空间站造成威胁。

D．与其它国家和中国自身十年前相比，目前中国经济具有两大独特的优势：一是总体储蓄率高；二是微观主体的市场化程度远较1998年东南亚金融危机时高。

溶液配制及滴定:

(1)配制一定物质的量浓度的稀硫酸。

用24.5％硫酸(密度为)配制100 mL 0.200硫酸时，需用酸式滴定管量取24.5％硫酸_______ mL,洗净的酸式滴定管应先              ，再用来量取所需的硫酸。

（2）用已配好的0.200的硫酸溶液测定氢氧化钠样品中杂质氯化钠的含量。

准确称取2.0克混有氯化钠的氢氧化钠固体试剂,将其配成100mL待测溶液,用浓度为0.200mol/L的标准硫酸酸溶液进行滴定，三次滴定的记录数据如下

测定出的氢氧化钠质量分数为           。

Few students would dream of getting a job as a shoe shiner working along the street. College students, in their own eyes and in the eyes of the public, are expected to get at least a proper job, if not working in a high-income or white-collar position.

Cai Yong’s decision to work as a shoe shiner shocked not only his parents, who had high hopes for him, but also his girlfriend.

“It is right for young graduates to be ambitious (有抱负的). But they have to start in a solid

and down-to-earth way,” Cai said. Cai is not alone in making such a choice. The company has got

12 college students in all.

“I come for the 800 yuan monthly pay,” said Xiao Ji, who is a student from Nanjing University. “I have grown up and no longer live on my parents,” he said.

“Working as shoe shiners can mean a bright future,” Cai said.

Not everyone can accept this job choice. Cai’s girlfriend left him because she felt ashamed to be with a shoe shiner, and Cai accepted the fact. “This is the price to be paid for a job,” he said.

A former shoe shiner, Zhong Haibo, from a medical college, believes it was a good training for the rest of his life. “There is nothing I can’t do after working as a shoe shiner,” Zhong said, meaning that such kind of experience in early life is helpful in a future job.

39. Cai Yong decided to work as          .

A. a college teacher  B. a company manager  C. a shoe shiner   D. a medicine maker

40. Why did Cai’s girlfriend leave him?  

A. They didn’t get along well with each other.   B. Her parents didn’t like him.

C. She found it a shame to marry a shoe shiner.  D. Cai had got a new girlfriend.

41. Most people think Cai’s choice          .

A. unbelievable     B. nice                 C. enjoyable      D. wonderful

42. From the passage we know Zhong Haibo          .

A. doesn’t like college life                           B. thinks highly of working as shoe shiners

C. is a middle school student                        D. is still a shoe shiner at the moment

英制螺纹的公称直径是指内螺纹大径，并用尺寸代号表示。( )

最大功率限制器的作用是（）。

A、控制输出轴功率不超过最大允许值

B、控制涡轮轴功率不超过最大允许值

C、控制压气机轴功率不超过最大允许值

D、控制发动机转子轴功率不超过最大允许值