为什么石英晶形态的缓慢转化体积效应比快速转化的大，而对制品的危害反而小？

长期资产包括（）

A．长期投资

B．固定资产

C．无形资产

D．长期待摊费用

E．土地

Dear Sir or Madam,

I’m writing to tell you that I’m interesting in the summer camp in Australia and I hope I can be become a member.

My name is Li Nan, a 18-year-old girl from Shaanxi, China, but I’m a Senior One student. As a student, I has learned English for 8 year. And I can communicate with foreigners in English free. As you know, I am a senior student now, so I know China well. I can introduced Chinese culture to foreign friends.

I hope I can accepted. I’m looking forward to receive your reply as soon as possible.

Yours 

Li Nan

如果一个正方形的边长是质数，那么它的面积一定是（　　）

A．质数

B．合数

C．奇数

D．偶数

政府投资应选择使边际人均投资额最大化的投资项目，该政府财政投资的决策标准是()。

A.资产-产出最大化标准

B.资本-劳动力最大化标准

C.就业创造标准

D.稀缺要素标准

润滑系统中的金属污染主要来自（）.

A.供油泵

B.回油泵

C.润滑喷嘴

D.轴承和齿轮