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hothikhanhuyen2501
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Xác định nhiệt độ nóng chảy của băng phiến (nguyên chất naphatalin) .Dụng cụ gồm :đồng hồ bấm giây,đèn cồm,giá thí nghiệm,lưới amian, băng phiến,nhiệt kế.Cho biết nhiệt dung riêng bằng phiến:c=1,3kJ/m^3 GIẢI GIÚP MÌNH VỚI Ạ
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Read the passage and then choose the correct answers. Every day of the year throughout the world, about twenty million paper bags and newspapers are screwed and thrown away. Making paper requires a lot of wood pulp and the work of millions of workers. Many countries have had plans to recycle waste paper to save money and labor. In countries where there is the cooperation of the public, paper mills recycle as much as sixty percent of waste paper. Their simple work is to take away the ink, crush it up and make it into pulp again. For every ton of recycled newsprint, twelve trees can be saved. We can insist that the more paper people save, the more trees are preserved. 1. _______ is used for making paper. a. paper bag b. newspaper c. wood pulp d. waste paper 2. To save money and labour, many countries _______. a. encourage pepple to use less paper b. have plans to recycle waste paper c. persuade people not to cut down trees d. make plans to produce pulp 3. How much waste paper do paper mills recycle? a. 6% b. 16% c. 60% d. 66% 4. The word “it” line 7 refer to _______. a. wood pulp b. waste paper c. newsprint d. ink 5. Which of the following sentences is not true? a. Millions of paper are thrown away every day. b. Making paper requires a lot of labour. c. One ton of recycled paper save twelve trees. d. People plant more trees in order to make more paper

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