越南客户要CQ和CO文件，这些都是什么呢，该怎么去办理？ - 知乎 CO是原产地证书，Certificate of Origin。 了解货物的原产地或出处,将有助于进口货物的所有者，判断货物是否有资格获得特殊待遇。比如关税优惠。 以及判断要进口的货物是否有资格进入越南。比如，越南不允许将原产于中国的旧机械设备进口到越南。
How to check Microsoft certification validity - Microsoft Q A Meanwhile, I found similar post to check Microsoft certificate, you can try the steps mentioned in How do i verify my Microsoft certificates? - Training, Certification, and Program Support - Training, Certification, and Program Support