有想过货币兑换机器如何知道你放入的是货币是一元、五元或者是十元的钞票呢？

Ever wonder how a money changer machine knows if you've given it a one, a five or a ten dollar bill?

youdao

有想过货币兑换机器如何知道你放入的是货币是一元、五元或者是十元的钞票呢？

Ever wonder how a money changer machine knows if you've given it a one, a five or a ten dollar bill?

youdao