BCG、OPV分别表示（）和（）。

阅读理解。

     One day, Jack and David went fishing. Jick took Tony with him on the river, when the dog saw a

bird, he wanted to run after it and tried to catch it. "All the fish are frightened and swim away," said

David, "Be quiet! Tony." Jack shouted at him. But Tony didn't listen to him. "Are we going home now,

David. Next time, I will not bring him here again." "Wait!" said David, "A fish is biting my line." "Look

out!" shouted Jack. But it was too late. The boy fell into the water, "Help! Help!" shouted David. But

Jack couldn't swim. Just then, Tony came out. He jumped into the water and pulled the boy onto the

bank and saved his life.

1. Tony is the name of ______.

A. a fish        

B. a dog          

C. a boy

2. Who didn't want to frighten the fish?

A. David        

B. Jack          

C. A and B

3. Who fell into the river and got wet?

A. David        

B. Jack            

C. Tony

4. Jack said that _______.

A. he shouldn't take Tony with him the next time

B. he shouldn't go fishing with David

C. he shouldn't go fishing

5. From the story we know _______.

A. a dog is a useful animal to us

B. we should bring a dog when we going

C. a dog can help us catch fish

CNC铣床上铣削平面斜度沟槽，最好方法是将虎钳旋转至图面要求之角度。（）

此时最紧迫的抢救措施是

A．请胸科医师会诊处理

B．清除上呼吸道异物，保持呼吸道通畅

C．输血

D．吸氧

E．左下肢夹板固定

产前检查一般从()

A．确诊早孕时开始 

B．每周检查一次 

C．每2周检查一次 

D．每4周检查一次 

E．每8周检查一次

如何防止药物的自动氧化？