Best with kilogram computation, can change the unit, it is double changeover kilogram, how many pairs are such a kilogram of business accounting, in that way custom account book is as good as contract manual right.

• 最好以公斤计算，可以把单位转换，把双转换为公斤，多少双是一公斤这样核算，那样海关帐就跟合同手册好对了。