... continuous sidewall core cutter连续式井壁岩心切割器 permeability plug测定渗透率的岩心块 retractable ore barrel可缩小取出的岩心筒 ...
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Materials used as cigarette papers, filter plug wrap and filter joining paper, including materials having an oriented permeable zone. determination of air permeability.
作卷烟纸用的材料，过滤纸和过滤嘴接缝纸材料，包括定向可透气部分用的材料。透气性的测定。
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