题目内容
材料损耗率的计算公式可以表示为（ ）
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The United States of America is located in the central part of North America, with the Atlantic Ocean to the west and the Pacific Ocean to the east.
The eastern highlands formed by the Appalachian Range hold one-third of the country’s continental territory.
The climate in the United States can be classified as temperate, with some mild subtropical and tropical zones.
Most of coal reserves are to be found in the Appalachians, the Cordilleras and the Rockies.
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