聚合物相对分子质量分布宽度增加对聚合物黏度大小影响是()A.增加 B.下降 C.不变

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问题:

聚合物相对分子质量分布宽度增加对聚合物黏度大小影响是()

A.增加

B.下降

C.不变

D.先增加后下降

考点:材料科学材料科学与工程材料科学与工程题库
题型:单项选择题

阅读短文,判断正(T)误(F)。(10分)

I am Mary. Today is Sunday.It’s my birthday.There is a birthday party in my  home.There  are  some drinks,food,fruit and flowers on the table.There is a big birthday cake,t00.My friends  come  to my party. They have a lot of presents for me —hair clips,CDs,cards,toys and comic  books.

My uncle comes to my party.He buys me some  chocolates.They are  my favourite My  father and mother buy me  a  new camera.We take some beautiful photos.We sit on the sofa.listen to music and chat with each other.

At last,all of them  walk to me and sing’Happy birthday’to me. Then  they share  the big cake  with me. I have a happy birthday.My family and my friends have a good time.

1.Mary’s birthday is on Saturday

2 Mary’s uncle has a camera for her.

3.Mary likes chocolates very much.

4.Only Mary’s friends come to the birthday party.

5.Mary has many birthday presents.

题型:单项选择题

当涉及主体和承重结构改动或增加荷载时,必须由原( )单位或具备相应资质的设计单位核查有关原始资料,对原有建筑结构的安全性进行核验、确认。

A.装饰装修工程

B.建筑设计

C.结构设计

D.施工

题型:单项选择题

机车在()情况下应关断总风缸112塞门。

A、机车重联

B、机车附挂

C、无动力回送

D、单机运行

题型:单项选择题

药品采购必有购进记录,没有药品购进记录的将处以

A.处以一万元以下罚款
B.处以一万元以上罚款
C.处以二万元以内罚款
D.警告或者并处一万j己以下的罚款
E.警告

题型:单项选择题

目前给水节水技术的内容不包括( )。

A.安装水表,控制流出水头值;减少卫生器具无效使用时间

B.减少一次用水量

C.雨水收集回用;污废水处理成中水后回用

D.减少卫生器具安装数量

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