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[求助] 请教:铅笔硬度和摆杆硬度基本对应关系是什么样的呢? |
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13321818232
QQ:1054189831 |
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13321818232
QQ:1054189831 |
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色漆和清漆+铅笔法测定漆膜硬度测试方法
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20年家具漆研发经验,助剂厂家
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