试剂级, 医药级, 食品级, 化妆品级, 工业级等.Reagent grade, pharmaceutical grade, grade, cosmetics, industrial, and so on.满城汉墓出土文物数量多, 品级高,文物科技价值和工艺价值高.Mancheng Han tombs excavated quantity, grade high heritage value and process - value te...
上述提到的产品都属于石油蒸馏物.All of the above - mentioned products fall under the category of Petroleum Distillates.这使得蒸馏物中 A:B 比率发生缓慢的变化.This results in a slowly changing ratio A : B in the distillate....