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骨痂（）
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公司的产品销量为20 000件，单价500元，固定成本总额为300万元，单位变动成本为200元，试计算其营业杠杆系数，并说明其含义。
（）是对教育专制性、等级化和特权化的否定．
There are many ways to learn about people of other lands. One way is to study the clothing other people wear. For thousands of years, people in different parts of the world have worn very different types of clothing. There are four big reasons for this. One reason might be religion. In many Moslem countries, women must wear veils to hide their faces. The veils must be worn in public. Veils are part of the Moslem religion. The second reason is that different materials are used in different countries. For instance, in France the materials used in clothing may be cotton(棉), silk, wool, or many other man-made materials. Most people in China wear cotton. The ways clothes are made are also very different. This is another reason why people dress differently. Western countries rely on machines to make most of their clothing. Someone living in India can use only hand power to make the clothing he needs. World-wide differences in customs also lead to differences in clothing. A Mexican farmer wears a straw hat with a brim(帽沿) up. In China, a farmer wears a straw hat with a brim down. Both hats are used to protect the farmers from the sun. Some of these customs have ’come down through thousands of years. The two examples of wearing hats are given in the last paragraph to show______.
If you can provide satisfactory after-sale service，your products will surely have a wide market here．
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