物流中心在供应链上的地位取决于它与上下游客户之间的关系。

完形填空。

     A is a new student. Mr. Wang is asking him some questions. 

W: are new here, am I right?

A: Yes, you are right, Mr. Wang.

W:  1  ?

A: Yes, what are they?

W:   2  ?

A: On July 14, 1983.

W: Where were you born?

A: I was born in Sydney in Australia.

W:   3  ?

A: For about eight years.

W: And  4  ?

A: They were born in Sydney, too.

W: Are they living in China?

A:  5  . He is coming soon.

(    )1. A. May I ask you some questions

           B. Shall I ask you any questions

           C. Can you ask me any questions

           D. Do you have any questions

(    )2. A. Where were you born

           B. When were you born

           C. Who was born on July 14, 1983

           D. Were you born on July 14, 1983

( )3. A. How often did you live there

           B. How did you live there

           C. Why did you live there

           D. How long did you live there

( )4. A. Were your parents born in Sydney, too

           B. Who were born in Sydney

           C. Where were your parents born

           D. When were your parents born

( )5. A. Mum is, but Dad works in Sydney

           B. Mum does, but Dad works in Sydney

           C. Dad is, but Mum works in Sydney

           D. Dad does, but Mum works in Sydney

王芳走一步的平均长度是59厘米，她从操场的这头走到那头一共走了253步．操场大约长多少米？

实验室用过氧化氢溶液分解的方法制氧气，该反应属于基本反应类型中的______反应，其中二氧化锰是______剂．若要证明二氧化锰催化剂，需要进行的三个实验是：①______；②______；③______．实验室用加热高锰酸钾的方法制氧气的过程中，管口放一团棉花的原因是：______，管口向下倾斜的原因是：______，实验结束后要先移导管后移灯的原因是：______．

所有的药剂都会对环境造成污染，因此无论什么情况下，药剂使用浓度越低越好。

简要说明DVM的显示位数和显示能力。