生物多样性不包括 A．生物遗传的多样性 B．生物物种的多样性 C．生物数量的多样

现要完成下 * * 项抽样调查：

①从10盒酸奶中抽取3盒进行食品卫生检查．

②科技报告厅有32排，每排有40个座位，有一次报告会恰好坐满了听众，报告会结束后，为了听取意见，需要请32名听众进行座谈．

③高新中学共有160名教职工，其中一般教师120名，行政人员16名，后勤人员2名．为了了解教职工对学校在校务公开方面的意见，拟抽取一个容量为20的样本．

较为合理的抽样方法是（　　）

A．①简单随机抽样，②系统抽样，③分层抽样

B．①简单随机抽样，②分层抽样，③系统抽样

C．①系统抽样，②简单随机抽样，③分层抽样

D．①分层抽样，②系统抽样，③简单随机抽样

某化学教师在一次化学测验中设计了下列试题，并对部分学生的考试结果进行了统计和分析。

【试题】将10g溶质质量分数为98%的浓硫酸稀释为质量分数为10%的稀硫酸，稀释所需的水为多少毫升？（水的密度为1.0g·cm^-3）

【考试结果】部分学生按下述思路解题，所需水的质量为，，88.2cm^-3＝88.2mL。

试根据上述解题过程及考试结果回答下列问题：

（1）本题的正确答案是什么？

（2）正确的解题思路是什么？

（3）分析学生解题错误可能是由哪些原因造成的。

In America there are no nobles or men of letters, and the common folk mistrust the wealthy. Consequently, (1) form the highest political class, and the most cultivated circle of society. They have therefore (2) by innovation, which adds a conservative interest to their natural taste for (3) . If I were asked where I place the American aristocracy, I should reply (4) that it is not composed of the rich, who are united together by (5) , but that it occupies the judicial bench and the bar.
When I started researching this topic, I found an interesting (6) Legal Reform Now. As the name suggests, this web site is devoted to (7) , and it is definitely concerned about the dominance of lawyers in (8) . There I read an article by a (9) from the University of Wisconsin. One observation the UW article (10) is that the legal profession is the dominant profession of the people (11) to public office. For example, about half our representatives and (12) of our senators are lawyers. No other profession (13) having the same number of people in political office.
Effectively, lawyers form our nation’s (14) organized political constituency in America. Lawyers (15) and lawyers interpret our laws. When judges are appointed, the American Bar Association is the only (16) that is consulted to rate the fitness of potential judicial appointees.
Our nation has been in existence for (17) and lawyers have been this nation’s aristocracy since its (18) . Our system works, but do we really want to have a single profession (19) our nation. Specifically, do we want to have the legal profession in charge (20) , that is something to think about.

In America there are no nobles or men of letters, and the common folk mistrust the wealthy. Consequently, (1) form the highest political class, and the most cultivated circle of society. They have therefore (2) by innovation, which adds a conservative interest to their natural taste for (3) . If I were asked where I place the American aristocracy, I should reply (4) that it is not composed of the rich, who are united together by (5) , but that it occupies the judicial bench and the bar.
When I started researching this topic, I found an interesting (6) Legal Reform Now. As the name suggests, this web site is devoted to (7) , and it is definitely concerned about the dominance of lawyers in (8) . There I read an article by a (9) from the University of Wisconsin. One observation the UW article (10) is that the legal profession is the dominant profession of the people (11) to public office. For example, about half our representatives and (12) of our senators are lawyers. No other profession (13) having the same number of people in political office.
Effectively, lawyers form our nation’s (14) organized political constituency in America. Lawyers (15) and lawyers interpret our laws. When judges are appointed, the American Bar Association is the only (16) that is consulted to rate the fitness of potential judicial appointees.
Our nation has been in existence for (17) and lawyers have been this nation’s aristocracy since its (18) . Our system works, but do we really want to have a single profession (19) our nation. Specifically, do we want to have the legal profession in charge (20) , that is something to think about.

在固定资产更新改造决策中，因提前报废固定资产发生的净损失应计入处置年度的息税前利润，抵减当年所得税，增加当年现金净流量。 ( )

断路器失灵保护的跳闸时间分为两段，时间短的跳（）断路器，时间长的跳（）断路器。