The PCB material code shall be added by the engineering department after the PCB documents are approved and sent out.
所有PCB的物料编码在PCB资料发出后，工程部即可增加该物料的编码。
Design the material code in the network source database using group coding technology and show detail examples of resource index database and test questions database.
运用成组编码技术对资源库中的资源进行编码设计，并以资源索引库和考试试题库为例进行详细说明。
Double seals: Material code for the secondary seal is directly followed by the product seal face codes.
注：双端面机械密封的型号表示方法为：在产品型号规格的后面书写两组材料代号，用横线相连。
Double seals: Material code for the secondary seal is directly followed by the product seal face codes.
注：双端面机械密封的型号表示方法为：在产品型号规格的后面书写两组材料代号，用横线相连。
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