圆柱状,长度为2-5毫米
Columned, length:2-5mm
检验标准:国标1987、国标2008、ASTM(美标)
Inspection Standard:National Standard 1987, National Standard 2008, ASTM(US Standard)
主要以孔容、苯吸附值、C.T.C区别品质
Mainly distinguished by pore volume, benzene adsorp- tion value and C.T.C
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