煤尘的灰分是不可燃物质，它能吸收热量而起到降温阻燃的作用，可减弱煤尘的爆炸性。

设

(其中a_i≠0，i=1，2，…，n)，则A^-1=______．

根据汉语提示填写单词。

1. When autumn comes, the _______(树叶) on the trees begin to turn yellow.

2. It's _______(不可能的) that he can come here before noon.

3. The singing sounds quite _______(美妙), doesn't it?

4. The students had their photos _______(拍照) in the middle of the square.

5. To be a doctor for children is very _______(值得的).

6. The children _______(认为) their teacher as a good friend.

7. Who _______(赢)the boys' long jump?

8. Which team _______(打败) the team from No.2 Middle School?

9. The bike is too expensive. I don't think it's worth _______(买).

10. My child _______(更喜欢) drawing to singing.

20世纪90年代之前，我国的长途电话网为典型的（）选路网。

A.分级

B.等级

C.无级

D.多级

企业上市财务顾问业务中，对于有再融资需求的客户，农业银行提供的再融资财务顾问业务运作流程为（）。

A.项目签约、组建服务团队、项目实施

B.项目签约、组建服务团队、项目实施、项目后评价

C.项目推荐、项目签约、组建服务团队、项目实施、项目后评价

D.与成熟项目的运作流程一致