关于保温工程质量的说法，正确的是（）。A.屋面泡沫混凝土分层浇筑、终凝后应进行至少1

额定电压交流1KV及以下、直流1.5KV及以下的应为低压电气设备。（）

阅读理解。

     Most American students go to traditional public schools.There are about 88, 000 public schools, all

over the US.Some students attend about 3000 independent public schools called charter schools.

     Charter schools are self-governing.Private companies operate some charter schools.They are similar

in some ways to traditional public schools.They receive tax money just as other public schools do.

Charter schools must prove to local or state governments that their students are learning.These

governments provide the schools with the agreement called a charter that permits them to operate.

     Charter schools are different because they do not have to obey most laws governing traditional public

schools.Local, state, or federal governments cannot tell them what to teach.Each school can choose its

own goals and decide the ways it wants to reach them.Class size is usually smaller than in traditional

public schools.

     The Bush Administration strongly supports charter schools as a way to re-organize public schools that

are failing to educate students.But some education agencies and unions oppose charter schools.One

teachers' union has just made public the results of the first national study comparing the progress of

students in traditional schools and charter schools.

     The American Federation of Teachers criticized the government's delay in releasing the results of the

study, which is called the National Assessment of Educational Progress.Union education experts say the

study shows that charter school students performed worse on math and reading tests than students in

regular public schools.

     Some experts say the study is not a fair look at charter schools because students in those schools

have more problems than students in traditional schools.Other education experts say the study results

should make charter school officials demand improved student progress.

1. If a private company wants to operate a charter school, it must______.

A. try new methods of teaching      

B. prove its management ability

C. obey the local and state laws      

D. get the government's permission

2.What's the government's attitude toward charter schools?

A. Doubtful    

B. Supportive.  

C. Subjective.  

D. Optimistic.

3. What can we learn from the text?

A. More students choose to attend charter schools.

B. Charter schools are better than traditional schools.

C. Students in charter schools are well educated.

D. People have different opinions about charter schools.

4. It can be interred from the text that ___.

A. charter schools are part of the public education system

B. one-on-one attention should be paid to students

C. the number of charter schools will be limited

D. charter schools are all privately financed    

半夏的催吐成分是（）

A.生物碱

B.3，4-二羟基苯甲醛葡萄糖苷

C.挥发油

D.半夏蛋白

E.甲硫氨酸

呈“J”型增长曲线增长的种群，其种群特征没有（）

A.出生率大于死亡率

B.年龄组成呈金字塔型

C.生存的空间和食物条件充裕

D.种内斗争

高侧壁

A．Ⅱ、Ⅲ、aVF导联
B．Ⅰ、aVL导联
C．V₁、V₂、V₃导联
D．V₃、V₄、V₅导联
E．V₅、V₆导联