建设项目经济评价的计算期是指（）。 A.从建成投产到主要固定资产报废为止所经历的时间

根据对话内容补全对话，每空一词。

A:  Hi, May I ask you some 1._______?

B: Certainly.

A: 2._______were you born?

B:  I was born 3. _______ May 15th, 1978.

A: Where 4._______you born?

B:  I was born in a town 5. _______Hangzhou.

A: 6. _______ 7. _______-did you live there?

B: We lived there 8. _______  about 8 years.  Then we moved here.

A: Why did you come here?

B:  9.________my father found work here.

A: Do you enjoy 10. _______ here?

B: Yes, I do.  Very much.

下列A、B、C、D、四列山脉为我国地形区的天然分界线，其中是我国地势二、三阶梯分界线的山脉是  (    )

一根圆木，横截面的周长是1.256米．把它锯成板材，锯出的最宽的一块板材宽多少分米？

文法符号的属性有综合属性和（）。

剖视图与剖面图的主要区别是什么？