每年进行1～2次精度调整，主要项目的精度不可超差的是（）类设备。A、B B、D C、AD

阅读理解。

       Li Hua, a middle school student in Yangzhou, doesn’t have time for breakfast. He always does his

homework until very late at night and can’t get up for breakfast the next morning. There are many other

students like Li. They don’t have healthy eating habits. Scientists from Southern University studied 1,790

students in Nanjing last year, according to the Xinhua News Agency. They found that 30% of middle

school students don’t have breakfast and 41.3 percent of students only eat the foods they like most.

      These bad eating habits may make the students fatter and affect the development of our bodies. A

study by the Ministry of Health(卫生部) in 2005 showed that about 20 percent of people aged 13 to 20

have a nutritional imbalance(营养失衡).This could cause high blood pressure and other serious problems. 

      Nutritional balance is important - especially for students. It can prevent health problems like diabetes(糖尿病). Proper nutrition(营养) also gives students enough energy to study.

      In order to improve students’ nutrition, many schools in China provide food between meals, such as

milk and fruit. Over half of Chinese middle and primary schools provide nutritious meals.

      However, some students don’t like the provided meals and have instant noodles(方便面) or KFC

instead. Hu Yongzhen, an expert from Southeast University, suggests that schools should improve their

nutritional meals in order to attract students. If possible, they should use the help of nutritional experts to

prepare meals for students.

     Tips to keep healthy:

     ★You shouldn’t eat what you like. You should eat all healthy food including meat, vegetables, fruit,

bread, noodles and milk. every day.

     ★Eat the right things for the seasons. In summer, people may sweat easily because of the hot weather. It is better to add a little more salt to food when you exercise in hot weather. And winter is coming, we can eat more red carrots which are full of vitamin C. It also helps stop a cough.

1. How many students don’t have breakfast in Nanjing last year?

A. 1,790

B. 537

C. 716

D. 358 

2.What problems may be caused if you have a nutritional imbalance?

A. High blood pressure

B. Diabetes

C. obesity(肥胖)

D. All of the above.

3. What’s the Chinese meaning of the word sweat ?

A. 增肥

B. 流汗

C. 吃东西

D. 运动

4. Which of the following is true ?

A. Bad eating habits won’t make the students fatter.

B. 30 percent of students only eat the foods they like most

C. We can eat more red carrots which are full of vitamin C.

D. Many students don’t like instant noodles(方便面) or KFC instead.

与十进制数1023等值的十六进制数为( )。

A．3FDH

B．3FFH

C．2FDH

D．3FFH

与原发性肝癌发病的有关因素()

A．乙型病毒性肝炎

B．肝硬化

C．黄曲霉素

D．吸烟

E．饮酒

女婴，9个月，生后一直牛奶喂养，未添加辅食。近一周来患儿每天腹泻5～6次，质稀，伴吵闹不安，睡眠差，出汗多。尚不能扶站，未出牙。考虑为维生素D缺乏性佝偻病。

若化验检查示血钙2mmol/L（8mg/dl），钙磷乘积为25，X线长骨检查示骨骺软骨明显增宽，干骺端临时钙化带消失，呈毛刷状及杯口样改变，则应属维生素D缺乏性佝偻病的（）。

A.初期

B.激期

C.恢复期

D.后遗症期

E.以上都不是

《熊猫霍尔的生活观》的作者是？（）

A、霍夫曼

B、歌德

C、席勒

D、格拉斯