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[填空题]It was Mexicans that first used poinsettias on the hearth to celebrate Christmas.
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[填空题]Helicopters were first used for military services in ______.
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Who probably first used the umbrella as a protection against rain
In Europe, ()first used umbrella as protection against the rain.
[判断题]Cotton was first used as material in Europe.
[填空题]The word horsepower was first used two hundred years ago. James Watt had made the world’s first widely used (11) . He had no way of telling people exactly how powerful it was, for (12) there were no units for measuring power.
Watt decided to find out how much work one strong horse could do in (13) . He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
He discovered that a horse lift a (14) weight 10 feet in one minute. Because his engine did (15) as much as the horse, Watt called it a ten-horsepower engine.
[填空题] The word “horsepower” was first used two hundred years ago. James Watt had made the world’’s first widely used ( 11 ) _________. He had no way of telling people exactly how powerful it was, for ( 12 ) _________ there were no units for measuring power.
Watt decided to find out how much work one strong horse could do in (13) _________ He called that unit one horsepower. With this unit he could measure the work his steam engine could do.
He discovered that a horse lift a (14) _________ weight 10 feet in one minute. Because his engine did (15) _________ as much as the horse, Watt called it a ten-horsepower engine.