根据公共程度的高低公共组织可分为（）。 A.政府组织 B.营利组织 C.第三部门组织

阅读短文，判断对错.

A: It's sunny today. Ruirui, let's go to the park.

B: Great!  Mum, I want to take my camera.

A: Okay! Put film in your camera.

B: Mum. May I go by bicycle?

A: No, Ruirui! Let's go for a walk.

B: Look, Mum, a big tree! How old is it?

A: It's about ten years old.

B: That's old. I want to take a picture.

A: Sure.

( ) 1. Ruirui and her father are in the park.

(     ) 2. They go to the park by bicycle.

(     ) 3. The tree is very old and big.

(     ) 4. The tree is five hundred years old.

(     ) 5. They take a picture of the old tree.

不能在有瓦斯或矿尘爆炸的场所使用的起爆器材是( )。

A．导爆管

B．导火索

C．继爆管

D．导爆索

15. The doctor bent _____ the boy and checked his wound.

A．up

B．on

C．above

D．Over

下列哪一项不是寒湿困遏证黄疸的特点（）

A.身目黄色晦暗

B.疸色如烟熏

C.脘腹痞胀

D.舌淡苔黄腻

E.脉沉迟

制冷压缩机的压缩机有什么功用？