问题
问答题 简答题
热轧有何优缺点？
答案
参考答案：
优点：能消除金属中铸造的某些缺陷，使其致密性和机械性能改善，加热后塑性好，变形抗力低，可增大变 形量，提高生产率，对设备要求相对低，降低造价，降低电能消耗。
缺点：加热产生氧化铁皮，轧件表面不光洁，产品尺寸不够精准，机械性能不如冷加工的好。
搜题请搜索小程序“爱下问搜题”
热轧有何优缺点？
参考答案：
优点：能消除金属中铸造的某些缺陷，使其致密性和机械性能改善，加热后塑性好，变形抗力低，可增大变 形量，提高生产率，对设备要求相对低，降低造价，降低电能消耗。
缺点：加热产生氧化铁皮，轧件表面不光洁，产品尺寸不够精准，机械性能不如冷加工的好。
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| Dick is a milkman in New York. He is near-sighted (近视眼). He has a red car. The car is neither expensive 1 very cheap. Many people have cars like that. Dick likes to go for a ride after supper with his big white dog. He calls his dog Bobby. Last Saturday evening Dick went to a circus (去看马戏). He went in his car with Bobby. Hundreds of people went to circus, and Dick was 2 to see so many cars there. "Where can I park my car?" he 3 . Bobby was clever. It knew 4 Dick was looking for. It jumped out of the car and ran 5 . Then it barked. It found a 6 between two red cars. Good! Dick was happy. He backed his car 7 the space and went with Bobby to see the show. Dick and Bobby had a good time. Dick laughed 8 and Bobby was 9 to see all the animals. When the show was 10 Dick went out and got into the car. "Come in, Bobby." he said to the big dog. But to his surprise, Bobby wouldn't listen to him. It jumped into the next car! Dick got out and 11 the dog back. But soon it jumped into the next car again! What's wrong with Bobby? Dick just couldn't understand. Now can you tell what was wrong with the big dog? Solution (解答): There was 12 wrong with the dog. It was sitting in its master's car 13 Dick was in someone 14 car. Remember: Dick was near-sighted and the three red cars were 15 red ones. | ||||
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