一般减速器的轴，其材质应选用（） A.耐热合金钢 B.球墨铸铁 C.45号钢 D.2

Huzhou, May 10 (Huzhou Daily)—A city eye examination has showed that Huzhou primary and high school children’s eyesight has been getting worse. It showed test results were lower than those from the last examination in 2010.

Only 10% of the tested students had good eyesight, but more than 30 percent in 2010. The examination covered 1,770 students from 54 classes. They were from primary and high schools in 5 districts.

According to the test results of the junior high school group, children from Anji District scored an average of four, much lower than 4.8. Below four is classed as short-sightedness. None of the students from Deqing District tested above 4.8.

Huzhou would adopt measures to improve children’s eyesight. Most importantly, students should be freed from the burden(负担) of exams and relax their eyes more often every day.

小题1:How many students had good eyesight in the eye examination?

A．177

B．277

C．530

D．1,770小题2:Where were the tested students from? They were from         .

A．primary and high schools in 54 districts

B．primary and high schools in 5 districts

C．primary and high schools in Anji District

D．primary and high schools in Deqing District小题3:Which of the following is classed as short-sightedness according to the passage?

A．The eyesight below 4.

B．The eyesight below 4.2.

C．The eyesight below 4.6.

D．The eyesight below 4.8.小题4: If the students want to improve their eyesight, what should they do?

They should       .

A．read in the sun

B．read more books

C．study hard

D．often relax their eyes

电力电缆截面积在（）以上的线芯必须用接线端子或接线管连接。

A.10mm2；

B.16mm2；

C.25mm2；

D.35mm2。

甲公司获得了某医用镊子的实用新型专利，不久后乙公司自行研制出相同的镊子，并通过丙公司销售给丁医院使用。乙、丙、丁都不知道甲已经获得该专利。下列哪一选项是正确的 ( )

A．乙的制造行为不构成侵权

B．丙的销售行为不构成侵权

C．丁的使用行为不构成侵权

D．丙和丁能证明其产品的合法来源，不承担赔偿责任

在机组停车后，可通过（）阀向框架工艺系统提供蒸汽。