空压机的加载压力值大于卸载压力值。

韦州中学初二（4）班的几个同学在“观察水的沸腾”实验中，当水温升到90℃时，随着加热过程，每隔1min记录一次水的温度．某同学记录的数据如下表：

（1）实验装置中为什么要在铁圈上放上石棉网？______；

（2）实验过程中应选用冷水还是热水做实验？为什么？______；

（3）在该实验中烧杯中的水装多少算合适？为什么？______；

（4）根据记录在图中坐标纸上画出水沸腾的图象．

（5）试根据实验现象归纳水沸腾时的特点：______，______．

在下列有关声卡的叙述中，错误的是

A．声卡的主要功能是控制波形声音和MIDI声音的输入和输出

B．波形声音的质量与量化位数、采样频率有关

C．声卡中数字信号处理器在完成数字声音的编码、解码及编辑操作中起着重要的作用

D．声卡所要求的数据传输率不高，用ISA总线进行传输即可

亚里士多德认为：“我们应该注意到邦国虽有良法，要是人民不能全部遵循，仍然不能实现法治。法治应包含两重含义：已成立的法律获得普遍的服从，而大家所服从的法律又应该本身制定的良好的法律。”这段话指出了( )。

A．丸在法治和德治的关系上，前者是优越于后者的

B．指出了法治的两个要素条件，已经接近于科学的法治的两个条件：制度条件和思想条件

C．指出了法治优越于人治，原因在于多数人的考虑要比少数人的考虑周到些

D．指出了“让一个人来统治，就在政治中混入了兽性的因素。常人既不完全消除兽欲，虽最好的人们也未免热忱，这就往往在执政的时候引起偏向。”

某公司产品销售收入为1000万元，变动成本率为60%，财务杠杆系数为2，所得税税率为40%，普通股共发行500000股，每股净收益0.96元，该公司要求每股净利润增长50%，则销售应增长( )。

A．10%

B．15%

C．20%

D．30%

The kids are hanging out. I pass small bands of students, in my way to work these mornings. They have become a familiar part of the summer landscape.

These kids are not old enough for jobs. Nor are they rich enough for camp. They are school children without school. The calendar called the school year ran out on them a few weeks ago. Once supervised by teachers and principals, they now appear to be in "self care".

Passing them is like passing through a time zone. For much of history, after all, Americans arranged the school year around the needs of work and family. In 19th-century cities, schools were open seven or eight hours a day, 11 months a year. In rural America, the year was arranged around the growing season. Now, only 3 percent of families follow the agricultural model, but nearly all schools are scheduled as if our children went home early to milk the cows and took months off to work the crops. Now, three-quarters of the mothers of school-age children work, but the calendar is written as if they were home waiting for the school bus.

The six-hour day, the 180-day school year is regarded as something holy. But when parents work an eight-hour day and a 240-day year, it means something different. It means that many kids go home to empty houses. It means that, in the summer, they hang out.

"We have a huge mismatch between the school calendar and the realities of family life," says Dr. Ernest Boyer, head of the Carnegie Foundation for the Advancement of Teaching."

Dr. Boyer is one of many who believe that a radical revision of the school calendar is inevitable. "School, whether we like it or not, is educational. It always has been. "

His is not a popular idea. Schools are routinely burdened with the job of solving all our social problems. Can they be asked to meet the needs of our work and family lives

It may be easier to promote a longer school year on its educational merits and, indeed, the educational case is compelling. Despite the complaints and studies about our kids’ lack of learning, the United States still has a shorter school year than any industrial nation. In most of Europe, the school year is 220 days. In Japan, it is 240 days long. While classroom time alone doesn’t produce a well-educated child, learning takes time and more learning takes more time. The long summers of forgetting take a toll.

The opposition to a longer school year comes from families that want to and can provide other experiences for their children. It comes from teachers. It comes from tradition. And surely from kids. But the most important part of the conflict has been over the money.

Why was Dr. Boyer’s idea unpopular().

A. He argues for the role of school in solving social problems.

B. He supports the current school calendar.

C. He thinks that school year and family life should be considered separately.

D. He ply believes in the educational role of school.