更多"Plastic 的制作First is used to produce"的相关试题:
[单项选择]Who first used the motto laisser faire
A. American industrialists.
B. French economists.
C. International leaders.
D. Civil War veterans.
[判断题]Cotton was first used as material in Europe.
[填空题]It was Mexicans that first used poinsettias on the hearth to celebrate Christmas.
[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.
