什么是机车车辆管件的互换性？

根据语境补全对话。(5分)

小题1:--- Maria felt sad because she failed to pass the physics exam.

--- __________________.

A.She can’t be like that.

B.What a pity!

C.She had better go to see the doctor.

小题2:--- Hi, Jane! What’s the matter with your mother?

--- ___________________.

A. She met her good friend in the street.

B. She feels nervous because she has to give a speech tomorrow.

C. She wants to buy a ticket to the film.

小题3:--- Hello, Miss Su! _______________.

---- Maria is still in the classroom, but the door is closed.

A. Anything wrong?   B. Something wrong?    C. Can I help you?

小题4:--- Michael, I think I will get nervous when I answer the teacher’s question.

--- ______________________________.

A.I think so.       B.Don’t be shy.         C.Take it easy.

小题5: --- Kangkang, my father invites you to have dinner tonight.

--- ______________________________.

A.Please say hello to your father.

B.That is a good idea.

C.Great! Please say thanks to your father.

国标法规定测定酒中甲醇杂醇油可用气相色谱法，须用的检测器是（）

A.电子捕获检测器

B.氢火焰离子化检测器

C.火焰光度检测器

D.热导检测器

E.以上四种都能用

下列对定量风险分析的目标描述不正确的是( )。

A．量化分析每一风险的概率

B．量化每一风险对项目目标造成的后果

C．分析项目总体风险的程度

D．为制定风险管理计划提供依据

早春播种后，用地膜覆盖的方法可以促进提早出苗的原因是           （   ）

A．保温、保湿，有利于种子萌发

B．防止病虫害

C．防止鸟类取食种子

D．种子萌发时需避光处理

用光纤作为媒体的LAN技术主要是

A．DQDB

B．FDDI

C．Token Bus

D．CSMA/CD