关于水泥砂浆地面层的施工准备内容，说法错误的有( )。 A．水泥材料的强度等级不低

单词拼写：请根据括号内汉\英语提示或已给的首字母写出单词的正确形式。

1. He e________ us for hours with his stories and jokes

2. Tibet is a ________(多山的) province.

3. U________, my computer system broke down again.

4. The learner of a second language has many difficulties to _______(克服).

5. We were a________ that she behave so rudely at the party.

6. The little boy a_________ himself by drawing pictures on the ground.

7. To our surprise, he made no _________(解释)of his absence.

8. Those who have not known ________ (hungry) can never imagine what it is.

9. The play was so _______ (humour) that the audience laughed all through it.

10. The news that Tom, an excellent student, had ________ (failure) his exams sur-prised us all.

根据有关规定，项目档案验收应在项目竣工验收( )完成。

A．30日之前

B．30日之后

C．3个月之前

D．3个月之后

一套完整的图册包括：设计说明、目录、（）、平面图、立面图、（）、家具图、给排水施工图、和（）。

如何预防萃取体系出现乳化？

根据所建立模型的不同，系统仿真相应的分成两大类，即物理仿真和数学仿真。数学仿真由于往往都是借助于计算机实现的，因此又称为（）仿真。

A.物理数学

B.数学物理

C.系统模型

D.计算机