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关于20#拉伸试验伸长率不合格的问题今天做了几个20#的拉伸试验,试件是标准矩形事件伸长率最低的只有15.钢管都是新进的20号钢,质量应该没有问题,请问可不可能是取样、机加工、试验环节 钢材拉伸试验,断口都在标距之外,怎么测量它的伸长率啊.只在标距两端划了两条线,中间和标距外都没有做标记, 请问：地震的时候自救措施有哪些? 白姐姐蛇有毒吗?这种 面临地震,我们应该采取什么措施进行自救? 大麦哲伦天文望远镜能扩大人类对宇宙的观测半径? 阜新处于干湿地区的?A.湿润地区 B.半湿润地区 C.半干旱地区 B.干旱地区§§§№№№№★○●◎■△▲※→←↑↓〓¤ 三相四线电能表.电流互感器乘20倍.在这表上又接了两块表.一个三相表.另一个是两相表.这两表上还乘20倍? 三相四线电能表接了四个电流互感器 而且比率还不一样,最后怎么算比率啊最上边那一个比率是100/5一匝,实际也绕了1匝,下边那3个是50/5三匝,实际绕了一匝,这样比率怎么算 宇宙的理论半径是多少? 会变色的蛇,是什么蛇.开始是翠青色的,一会变白色的.是什么蛇.如题. 梦见2条蛇,1条红色和一条青色是什么意思呀?自己还没有怀孕. 怎样理解对立统一规律? 生活中的声音用上象声词作文的结尾 怎么晚上天边是亮的?是地震前兆吗? 人类太空探测活动需要有详细的时间和发射国家,从1957年10月4日前苏联发射了第一颗人造卫星开始.多多益善. 地震发生后我们要采取哪些自救措施 地震发生后应当采取哪些自救措施? 当火线对零线是220伏时,在火线上串一个10欧的电阻,量得电阻的两端对零线各是多少伏?我是说电阻是悬空的,用万用表去测电阻两头对零线的电压各是多少伏.都是220伏吗?为什么? 英语翻译Birds of one kind often stay together in one group,or flock.In every flock,some birds are more important than others.Each bird has its own place.This order goes from the most important to the least important.It is called the “pecking or 金属圆环在无界限的磁场中切割磁感线,没有产生感应电流,但是感应电动势是如何抵消的,最好画个图吧,详 人工合成骨髓灰质炎病毒是生命结构,为什么? 人类已经观测到的宇宙半径有多少千米? 物理需要记忆的科学家们名字发明发现贡献会考的… 上次就因为这个什么科学家害我丢了分 地震时为什么天边会出现光 英语翻译How can you think in English?I think the best way is to practice as what a football player does every day.During the practice ,the football player will pass the ball to his teammates over and over again.So he won’t have to think about p 在各种角落怎么防地震,怕出地震挂了我 英语翻译Once there was a father and a son.They were ill-tempered and never gave way to others.one day,the father decided to ask some friends to dinner.As his father wanted,the son went to buy something at the market,then he turned back and walked 英语翻译It was midnight.Mrs Wilson was lying in bed,still awake.She stood up and looked out of the window.She saw a man in the garden.He was trying to open the window of Bob Smith’s bedroom in the house next door.Mrs Wilson quickly went into th 英语翻译Just seven years ago,the Jarvik-7 artificial heart was being cheered as the model of human creativeness.The sight of Barney Clark-alive and conscious after trading his diseased heart for a metal-and-plastic pump-convinced the press,the pu 有感应电流这一说法,有感应磁场这一说法吗?介绍详细点,意思是不论磁生电还是电生磁都是产生“感应XX”的？ 朝霞和日出 阅读天亮了.东方天际露初鱼肚的颜色.渐渐地,鱼肚变成淡红色,好像人们会喝了一点酒,脸上呈现出的红晕一样.接着,它又由淡红慢慢地变成深红,再由深红变成金黄的颜色.这时,周