简述GB3701--82煤焦油的甲苯不溶物试验原理及试验允许误差?
甲苯不溶物系煤焦油中不溶于甲苯中的物质,将约3g焦油试样装在滤纸筒中,放人脂肪抽提器中,用热甲苯连续洗涤,称出残渣重量,算出甲苯
溶物含量。
试验允许误差:
同一化验室:0.6%。
不同化验室:1.2%。
暂无解析
Wearepreparetoofferourcomputerstoyouatthespecialdiscountrateof15%.
一个人的成长绝大部分取决于后天环境。
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