2. 职称英语
  3. The word horsepower was first used two hundred years ago. James Watt had mad

The word horsepower was first used two hundred years ago. James Watt had mad

游客2024-07-15  31
问题     The word horsepower was first used two hundred years ago. James Watt had made the world’ s first【B1】______ used steam engine. He had no way of telling people【B2】______ how powerful it was, for at that time there were no units for measuring power. Watt decided to【B3】______ how much work one【B4】______ horse could do in one minute. He called that unit one horsepower. With this unit he could measure the work his steam engine could do. He【B5】______ that a horse could lift a 3,300-pound weight 10 feet into the air in one minute. His engine could lift a 3,300-pound weight 100 feet in one minute. Because his engine did ten times as much work as the horse, Watt called it a ten horsepower engine. [br] 【B2】
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答案 exactly
解析 exactly意为“确切地”。
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