There is a green residue in the bottom of the test tube.
试管底部有绿色的沉淀物。
The stable adhesive ensures firm positioning of plate and preventing it from movement. At the same time rendering it easy for peeling without residue for both top and bottom masking.
稳是的粘接削可确保加工中板材的定位并防止移位，但加工后顶部和底部的保护层易于剥离且无残留物。
Sometimes called heavy oil from atmospheric distillation bottom atmospheric residue.
有时将从常压蒸馏塔底所得的重油称为常压渣油。
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