2017年1月17日国家能源局公布《能源发展“十三五”规划》《天然气“十三五”规划》，首次明确“发挥市场配置资源的决定性作用”，到2020年天然气综合保供能力应达到3600亿立方米以上，天然气消费占一次能源消费比例达到8.3~10%。2017年，我国天然气消费总量2373亿立方米，同比增长15.3%；全年天然气进口量920亿立方米，同比增长27.6%。
2017年1月17日国家能源局公布《能源发展“十三五”规划》《天然气“十三五”规划》，首次明确“发挥市场配置资源的决定性作用”，到2020年天然气综合保供能力应达到3600亿立方米以上，天然气消费占一次能源消费比例达到8.3~10%。2017年，我国天然气消费总量2373亿立方米，同比增长15.3%；全年天然气进口量920亿立方米，同比增长27.6%。
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Why do we laugh For years scientists have asked themselves this question. No animals laugh and smile—only human beings do. So does laughing help us to live longer The answer seems to lie in that smiling and laughing help us to become less worried and calm, preventing illnesses that are caused bystress. Laughing is really the best medicine. But if you"re unhappy, it can"t do you any good to smile, can it That"s not true. It is clear that smiling works just in the same way whether you feel like smiling or not. Scientists in California asked a group of students to act five different feelings: happiness, sadness, anger, surprise and fear—just using their faces. Changes in their heart rate, blood pressure and temperature were recorded. Most of the feelings they acted didn"t cause changes, but when the students smiled, their heart rate and their blood pressure went down. That happened even though they were only acting! So even if we feel sad inside, smiling seems to make us feel better. Now, what makes us laugh (82)It seems that the answer to the question is far from simple.Everyone likes jokes, but we don"t laugh at the same ones. It depends largely on how old we are. There are some jokes, for example, that children love but older people might not find funny.
Why do we laugh For years scientists have asked themselves this question. No animals laugh and smile—only human beings do. So does laughing help us to live longer The answer seems to lie in that smiling and laughing help us to become less worried and calm, preventing illnesses that are caused bystress. Laughing is really the best medicine.
But if you"re unhappy, it can"t do you any good to smile, can it That"s not true. It is clear that smiling works just in the same way whether you feel like smiling or not. Scientists in California asked a group of students to act five different feelings: happiness, sadness, anger, surprise and fear—just using their faces. Changes in their heart rate, blood pressure and temperature were recorded. Most of the feelings they acted didn"t cause changes, but when the students smiled, their heart rate and their blood pressure went down. That happened even though they were only acting! So even if we feel sad inside, smiling seems to make us feel better.
Now, what makes us laugh (82)It seems that the answer to the question is far from simple.Everyone likes jokes, but we don"t laugh at the same ones. It depends largely on how old we are. There are some jokes, for example, that children love but older people might not find funny.
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某企业只生产乙产品，原材料在生产开始时一次投入，产品成本中原材料费用所占比重很大，月末在产品按所耗原材料费用计价。5月初在产品费用2800元。5月生产费用：原材料12200元，燃料和动力费用4000元，职工薪酬2800元，制造费用800元。本月完工产品400件，月末在产品200件。如果在产品成本按其所耗用的原材料费用计算，则乙产品月末在产品成本和完工产品成本分别为______。
A．5000B．6500C．17600D．19800
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