男孩，2岁，右侧阴囊肿大，直立时阴囊肿大明显，平卧时消失，阴囊光滑如水晶，透光试验阳

改错。

1. There is a picture on 32 page.  _____________

2. I don't like bread and eggs. _____________

3. There are 24 hour in a day.  _____________

4. There aren't some people in the room.  _____________

5. Please you open your book.  _____________

6. He look like his father.  _____________

7. Does he has any water? _____________

8. What's color is your dress?  _____________

9. Who's shirt is this? _____________

10. I have lunch at the middle in the day. _____________

惰行泵的结构及作用？

有两个羰基峰，峰值差为24～38cm^-1的是( )

A．1，8-二羟基蒽醌
B．1-羟基蒽醌
C．蒽酚
D．1，4-二羟基慧醌
E．无α-羟基的蒽醌

波特隆起可见于（）。

A.下呼吸道感染

B.脑脓肿

C.海绵窦血栓性静脉炎

D.眶壁骨膜下脓肿

E.硬脑膜外脓肿

为什么对同一接头使用多种焊接方法进行焊接？