何为步进电动机连续运行频率？它与起动频率比有何特点？ 发布时间：2021-01-10 14:12 │ 来源：www.tikuol.com 题型：问答题 简答题 问题： 何为步进电动机连续运行频率？它与起动频率比有何特点？
题型：问答题 简答题 阅读理解。 In one way of thinking, failure is part of life. In __1__ way, failure may be a way towards success. The "Spider-story" is often __2__. Robert Bruce, leader of the Scots in the 13th century, was hiding in a cave from the English. He watched a spider __3__ a web. The spider tried to reach across a rough __4__ in the rock. He tried six times. On the __5__ time he made it and went on to make his web. Bruce is said to have been encouraged by this and to have gone on to __6__ the English. Edison, the inventor of the light bulb, made __7__ models that failed before he found the right way to make one. Once he was asked __8__ he kept on trying to make a new type of battery when he had failed so often, he replied, "Failure? I have __9__ failure. Now I know 50,000 ways it won't __10__." So what? First, always think about your failure. What caused __11__? Were conditions right? Were you in top from yourself? What can you change? So things will go __12__ next time. Second, is the goal you're trying to reach the right one? Try to do some __13__ about what your real goals may be. Think about this question. "If I do succeed in this, where will it get me?" This may help you prevent failure in things you shouldn't be doing any way. The third thing to keep in __14__ about failure is that it's a part of life. Learn to " live with yourself " even though you may have __15__. ( )1. A. other ( )2. A. told ( )3. A. doing ( )4. A. room ( )5. A. tenth ( )6. A. save ( )7. A. hundred ( )8. A. why ( )9. A. not ( )10. A. do ( )11. A. one ( )12. A. high ( )13. A. thinking ( )14. A. heart ( )15. A. failed B. another B. said B. taking B. house B. sixth B. help B. hundreds B. when B. no B. make B. it B. large B. shopping B. eyes B. succeeded C. first C. talkedC. making C. place C. eighth C. defeat C. hundred ofC. what C. never C. took C. that C. right C. reading C. ears C. finished D. second D. spoken D. playing D. soil D. seventh D. kill D. hundreds ofD. who D. nothing D. work D. this D. bright D. cleaning D. mind D. passed 查看答案
题型：问答题 简答题 一个长方体蓄水池，长30m，宽120m，深2.2m．（1）这个蓄水池的占地面积是多少平方米？池里的水离池口0.2米，池里一共蓄水多少立方米？（2）如果把这个蓄水池的池底和四壁都铺上边长是5dm的正方形瓷砖，至少需要多少块这样的瓷砖？ 查看答案