等差数列{an}中，已知a1=13，a2+a5=4，an=33，则n的值为（ ）

根据括号内的汉语提示，完成句子。

1. My ________ (第一的) name is Jack. What about yours?

2. Sorry, I can't ________ (拼写) the English word. Can you help me?

3. Mr. Smith has two ________ (女儿). They are both teachers.

4. Can you ________ (带来) some things to school, Ellen?

5. —Let's play soccer! —That ________ (听起来) great!

6. Tom ________ (观看) TV at home every day.

7. What ________ (食品) does your mother like?

8. I like ________ (草莓) very much. But she doesn't like them.

9. My family and I like ________ (运动) after dinner.

10. I don't like tennis. It's ________ (无聊的).

图是一种常用的动圈式话筒，当你对着话筒说话时，声音使与膜片相连的线圈振动，线圈在磁场中的这种振动．能产生随着声音变化而变化的电流，这是______现象，随着社会的发展，无线电广播、电视、手机等都已逐步进入了寻常百姓家，它们都是靠接收______工作的．

在风险管理中各类主体对风险管理技术适用性及收益性情况的分析、检查、修正和评估。这些行为所属的环节是（）。

A、风险估测

B、风险评价

C、评价风险管理效果

D、选择风险管理技术

热力学效率定义为（）消耗的最小功与（）所消耗的净功之比。