单螺杆挤出机的挤出系统和传动系统包括哪几个部分？

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问题问答题简答题

答案

参考答案：

单螺杆挤出机由传动系统，挤出系统，加热和冷却系统，控制系统等几部分组成。挤出系统和传动系统主要包括传动装置、加料装置、机筒、螺杆、机头和口模等五部分

选择题

老年人行动迟缓，运动功能减退，容易生病是[ ]

A．肌细胞和胸腺细胞萎缩导致的

B．肌细胞和胸腺细胞癌变导致的

C．神经细胞和淋巴细胞死亡导致的

D．物质和能量的摄入量减少导致的

补全对话，情景问答

补全对话，每空一词。

A: Look at the picture!

B: Oh, it's nice picture of a __1__. Is it your family, John?

A: Yes, it is. Can you see me in this picture?

B: Is the boy __2__ red you?

A: Yes, he is.

B: __3__ is the old man?

A: He's my grandfather.

B: And this old woman.

A: She's my __4__.

B: Is this your father?

A: No, __5__ isn't. He is my uncle. The man beside (在……旁边) my uncle is my __6__.

B: Who is the woman beside your father?

A: Oh, she is my __7__.

B: Your mother is very beautiful (漂亮的).

A: __8__ you very much!

B: Is the __9__ your sister?

A: No, she isn't She is my uncle's __10__.

B: I see. She is your cousin. You have a nice family.

A: Thank you!