[img]http://b31.photo.store.qq.com/http_imgload.cgi?/rurl4_b=1a47769b3cd6dcd39c34e47f078a50022730c34ae9ae56bb213169671d0dd554d56119880318500ba0f971a2a0722aa0042a0438efc6e1274af619309334116f9f44393622084223968cbc3c58b1d0caf2d46f98&a=36&b=31[/img]请高手帮忙写一下如何测量20.8的寸法最准确？急急！！
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