为什么游标卡尺比普通直尺量得精确?

http://s4/mw690/001wCrYsgy6FkiWmuA363&690
http://s10/mw690/001wCrYsgy6FkiWqdh769&690
http://s5/mw690/001wCrYsgy6FkiWs1Xm64&690
http://s7/mw690/001wCrYsgy6FkiWu6qi66&690
http://s10/mw690/001wCrYsgy6FkiWqdh769&690
http://s5/mw690/001wCrYsgy6FkiWs1Xm64&690
http://s7/mw690/001wCrYsgy6FkiWu6qi66&690
前一篇:怎样做一把简单而实用的测距标尺?