库房的温度对病案的有效保存影响很大，当库房温度高于30℃时：（） A.纸张耐折度降低

阅读下面短文，把A-D 四个句子填入文中空缺处，使短文内容完整正确，然后完成第5题。

Dear Joyce,

        I'm writing to tell you something about a Chinese American singer, Fei Xiang. His English name is Kris

Phillips. He is nearly two meters tall, with brown eyes, looking like an Asian. Though he was born in Taiwan,

he grew up speaking Chinese to his mother and English to his father and the students at Stanford University in

California.     1    .

        In 1986, Fei Xiang visited the mainland and became a pop star there.      2     , such as Fire in Winter,

Clouds of My Homeland, etc.

        He left the mainland for New York four years later.     3      . He lived a quiet life in New York, for only

a few people knew his name.

        Now Phillips has ended his six-year stay in the USA and returned to the mainland and his recording

career(生涯).      4     , including the song Maria from West Side Story.

        Now I think you have known a lot about Phillips.

A. There he worked as a menial (仆人的) worker

B. He was well-known among the young people and his songs were widely accepted

C. His new project (事业) is to introduce the mainland to the music of the Broadway stage

D. Later he returned from abroad to Taiwan and became a singer

5. Which of the following is true?[ ]

A. Fei Xiang's parents are both teachers.

B. Fe Xiang lived in the mainland for four years, later on he went to New York.

C. Fei Xiang is regarded as a pop star both in America and China.

D. Fei Xiang returned to the mainland in 1986.

试述视觉形成的主要过程。

DF4B型机车电阻制动采用（）控制。

凡（）种产品共同耗用的材料，应按一定的标准在各产品中分摊费用

A.两

B.三

C.四

D.几

氨制冷系统安装时，油包或放油口在设备一端的贮液器、卧式蒸发器等设备，安装应坡向放油包或油口的坡度是（）。

A、2/10

B、2/100

C、2/1000