base coating和hard coating有什么区别

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• base coating和hard coating有什么区别
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• 1.用符号表示：
• 已知直线a1x+b1y=0和a2x+b2y+1=0的交点为P（2,3）,则过两不同点Q1（a1,b1).Q2(a2,a2)的直线方程是——————————