内蒙鱼苗价格:Who can tell me the difference between 'sum qty.' & 'cum qty.'?

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收到一份excel表。里头有这样两列，不晓得是什么意思，请教高人！

qty是quantity的简写，意思是“量；数量；”

sum是“总共”的意思，所以－－sum qty.“总数，总量”

cum是附加的意思，所以 cum qty.应该是附加量的意思。

sum qty: 总量
cum qty: 附带量

sum qty是指总金额(总数量)
cum qty是指总立方数

who can tell me? Who can tell me ??? Who can tell me? who can tell me? Who can tell me ? who can tell me...................... Who can tell me???~ who can tell me? Who can tell me ? who can tell me ?