这些牙膏或牙粉含有粗槽的磨牙剂，使用龈线上的牙齿的磨损增加。
Sometimes they contain rough abrasives that cause increased abrasion of the teeth at the gum line.
在硫酸的催化作用下，竹废料在由聚醚多元醇和粗甘油组成的混合液化剂中可被液化成多羟基化合物。
The bamboo residues could be liquefied to be biopolyol in the mixed solvent of polyether alcohol and crude glycerol under the catalysis of concentrated sulfuric acid.
对于以沥青质、胶质为主要成分的有机垢堵塞，确定以粗苯-柴油（9∶1）复配体系为有机解堵剂；
For the organic scales mainly composed of asphaltene and gum, an organic scale remover containing benzol and diesel (9:1) is selected.
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