已知一回归函数的已释方差和未释方差分别为143.45和11.31，则可决系数为（）。

阅读理解。

     My name is Jim. I am eleven. I have got a small family. There are three people in it, my father, my

mother and I.

     My father is a teacher of Chinese. He goes to work at 7:30 in the morning and comes back at 5:00

in the afternoon. My mother is a doctor. I am a student.

1. How old is Jim? He is _______.

A. Three        

B. Ten        

C. Eleven      

D. Twelve

2. Jim hasn't got a _______.

A. brother      

B. teacher      

C. father        

D. mother

3. His father teaches _______.

A. English      

B. Japanese    

C. me          

D. Chinese

4. Jim's mother is a _______.

A. a policewoman    

B. teacher    

C. doctor      

D. manager

5. Jim is a  _______.

A. middle school student  

B. friend    

C. student    

D. doctor

用7.5-10MHz高频探头，探测正常附睾，超声显示（）。

A.附睾头，而体尾不显示

B.附睾头、尾而体部不显示

C.睾丸，而附睾不显示

D.附睾头、体及尾均显示

E.附睾头、尾及输精管显示

正常胎儿循环时血氧饱和度最高的部位在（）

A.脐动脉

B.脐静脉

C.下腔静脉

D.上腔静脉

E.升主动脉

长日照处理，促进（）植物早开花。

机构中只要有一个运动副是低副的机构就是低副机构。