天气预报 > 其他 > 银元为什么能吹响
银元为什么能吹响
更新时间: 2020-11-08 00:00:00  

银元能吹响是因为银元的延展性和弹性的综合作用有利于振动,侧吹银元时等于给了银元边缘一个侧向力,银元等半径的各个部分相互间产生了共振,共振通过空气传播后形成了能听到的声音。凡成色高的银元,声音一般较柔和悦耳。不足成色的银元,因含铜量高,声色嘶哑、短促而又浑浊。假银元音长尖高或低闷。听声音一是靠“敲”,以左手拇指尖和中指尖轻轻捏住银元的中心。用右手持另一枚银元敲击其边缘,听其声音进行鉴定,先把不正常的和可疑的银元挑出来,再行鉴别。二是靠碰,用右手拿一定数量(8至25枚左右)的银元,向下45°斜滑至左手,听其碰撞发出的声音,并结合图案、花纹来鉴定。

关键词: 银元 为什么 吹响

银元为什么能吹响相关经验

天气预报

最新推荐

页面:/news/view-927130/ | 耗时:0.5478 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=927130 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=927130 LIMIT 0,1
select * from tbl_Articles_sphinx where id=927130 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1954140,1069922,1118056,1126142,1109831,1275657,1047685,1129255,1114582,1045346,1111364,2179796,1069509,1087813,1125066,1088636,1091663,1384464,708825,1073415,1113041,1080717,1102328,1065303,1119492,2178786,1130742,496814,1062308,1066622) ORDER BY field (ArticleID,1954140,1069922,1118056,1126142,1109831,1275657,1047685,1129255,1114582,1045346,1111364,2179796,1069509,1087813,1125066,1088636,1091663,1384464,708825,1073415,1113041,1080717,1102328,1065303,1119492,2178786,1130742,496814,1062308,1066622)