Finally, a mineral must have definite chemical composition.
再一点是一种矿物必须具有一定的化学成分。
2
The barium polymetaphosphate was depolymerized by hydrogen peroxide in alkaline solution to barium phosphate which had definite chemical composition.
在强碱性溶液和过氧化氢的作用下，聚偏磷酸钡转化为有确定磷钡比的磷酸钡。
3
The theoretical results suggested that both the thickness and composition of the oxide film were definite after the electrode processes reached stable states.