在粉尘加工厂，为防止粉尘直接进入机械内，应设置机械外罩，外罩的倾角要求保持在()以上

某退休职工现有100万元的存款可用于投资，有三个期限均为10年的方案可供选择：方案A，存入银行，复利计息，存款年利率为8%；方案B，购买某理财产品，前5年每年年初存入20万元，利率为12%，期末一次还本付息；方案C，投资于某知名连锁项目，期初一次投入100万元，预计第三年至第六年，每年年末盈利20万元，从第七年至期末，每年年末盈利25万元，同期银行存款年利率为8%。

假定不存在投资风险，在选择方案C的情况下，预计该职工期末可盈利多少？

安全生产法律体系的基本框架中，( )适用于安全生产领域中普遍存在的基本问题、共性问题的法律规范，它们不解决某一领域存在的特殊性、专业性的法律问题。

A．综合性法

B．普通法

C．单行法

D．特殊法

Pupils work harder in lessons if they are taught by a man, a study has claimed. Male teachers are more likely to improve pupils' self-esteem and are judged by pupils to be more fair, according to a study published by the Department for Education.                                                             

But there is a significant shortage of male teachers, especially in primary schools, with reports last month indicating that almost one in three primaries has an all-female teaching staff. The latest figures heightened fears that schools are becoming dominated (主宰) by women and children are being denied access to male role models in the classroom.                        

Researchers at the London School of Economics and Westminster University conducted an experiment in which each of 1,200 pupils in 29 schools was given £2. They could use the money to "buy" up to 10 questions at a cost of 20p each, which they then had to answer. If they were right they were given an extra 20p, but if they were wrong they lost 20p. Boys and girls who had a male teacher chose on average almost half a question more than those taught by women, indicating that they had a more positive outlook on the rewards of effort, the the study said.                                            

Researchers wrote: "One of the most significant results featured in this experiment is the positive effect of male teachers on effort. The experiment suggests that higher ability pupils either believed that the teacher would reward them more favorably or had a preference for working hard to please the teacher."                                                     

According to the Good Teacher Training Guide, 86 per cent of new teachers entering primary schools are female, along with 62 per cent of those entering secondary schools.                                             

Professor Alan Smithers, of Buckingham University, said: "This is an interesting and somewhat surprising finding, but it does underline the importance of having a good mix of male and female teachers in classes."

小题1:Which of the following is true of the passage?  

A．Male teachers are more fair than female teachers.

B．Now most primary schools are in need of teachers.

C．Most people are afraid that their children can't get access to male teachers.

D．The author thinks that male teachers are better than female teachers.小题2:What is the author's attitude to the finding that pupils work harder in lessons if they are taught by a man?   

A．He is for the finding.

B．He is against the finding.

C．He doesn't show his opinion about it.

D．He thinks it’s interesting and somewhat surprising.小题3:What does the author mainly tell us in the 3^rd paragraph?   

A．Researchers at the London School of Economics and Westminster University conducted an experiment.

B．Students could use the money to "buy" up to 10 questions and then had to answer them.

C．Boys and girls who had a male teacher chose on average almost half a question more than those taught by women.

D．The experiment shows that students taught by male teachers had a more positive outlook on the rewards of effort.小题4:It can be inferred that         .  

A．one third of primaries has an all female staff

B．if a student is taught by a man teacher, he will think that if he works harder he will make greater progress

C．86 per cent of new teachers entering primary schools are female

D．this finding is interesting and surprising小题5:Where can we find the passage?   

A．It is from a PE section on the Internet.

B．It is from an educational magazine.

C．It comes from the social section of a newspaper.

D．It comes from an English teaching book.

现有下列物质：①氢气；②明矾；③氦气；④氮气；⑤氧气；⑥二氧化碳。请选择正确的序号填空。

（1）最轻的气体是              ；

（2）能用于制造硝酸和化肥的是              ；

（3）能用于金属切割的气体是              ；

（4）可填充飞艇的稀有气体是              ；

（5）可作光合作用原料的是              ；

（6）可作絮凝剂的物质是              。

试述合理调节财政收入规模的基本思路。