非梗阻性单纯肾盂扩张时，肾图c段下降缓慢，注射呋塞米（速尿）后的表现是（）。 A.c

关于吸入高浓度氧对脑的影响，下列哪项正确（）

A.脑压增高

B.脑血管扩张

C.脑淤血

D.脑水肿

E.脑血管收缩

某厂一台300MW机组由于锅炉泄漏需要立即停机，该机组状态应记录为（）。

A、非计划停运

B、停用

C、可用

D、备用

若-1，0，1，2，a，3的极差是6，则a的值是______．

Adrian's “Amazing Race” started early when his parents realized that he, as a baby, couldn't hear a thing, not even loud noises. In a special school for the hearing­impaired (听觉受损的)，he learned sign language and got to mix with other disabled children. However, the sight of all the disabled children communicating with one another upset his mother. She wanted him to lead a normal life. So after speaking to an advisor, she sent him to private classes where he learned to read lips and pronounce words.

Later on, Adrian's parents decided to send him to a regular school .But the headmaster tried to prevent them from doing so, saying regular school couldn't take care of a special student. His parents were determined to take the risk and push him hard to go through his work every day because they wanted to prove that, given the opportunity, he could do anything. Adrian made the grade and got accepted. It was a big challenge. The pace(节奏) was faster so he had to sit at the front of the class and really pay attention to the teacher, which wasn't always easy. But he stuck to it and did a lot of extra work after school.

The efforts made by Adrian and his parents paid off. Adrian graduated with good grades and got into a top high school. He also achieved a lot in life outside school. He developed a love for the outdoors and went to Nepal to climb mountains. He even entered the World Yacht Race—being the first hearing­impaired Asian to do so.

But none of these achievements would have been possible without one of the most important lessons from his mother. “If you believe in yourself and work hard, you can achieve great results，” she often said.

小题1:How did Adrian communicate with other children in the special school?

A．By speaking.

B．By using sign language.

C．By reading lips.

D．By making loud noises.小题2:Adrian's parents decided to send him to a regular school because________．

A．they wanted him to live a normal life

B．they wanted to prove the headmaster wrong

C．he wouldn't mix with other disabled children

D．he wasn't taken good care of in the special school小题3:How did Adrian finally succeed in his study?

A．He did a lot of outdoor activities.

B．He was pushed hard to study every day.

C．He attended private classes after school.

D．He worked very hard both in and after class.小题4:Why is Adrian's life described as an “Amazing Race”？

A．He did very well in his study.

B．He succeeded in entering a regular school.

C．He reached his goals in spite of his disability.

D．He took part in the World Yacht Race.

扫描法是实体造型系统中建模方法之一，简述其基本思想、表示方法和特点。