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。
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。
The theoretical results suggested that both the thickness and composition of the oxide film were definite after the electrode processes reached stable states.
结果表明金属铜在腐蚀达到稳态时其表面氧化膜具有一定的组成和厚度；
The theoretical results suggested that both the thickness and composition of the oxide film were definite after the electrode processes reached stable states.
结果表明金属铜在腐蚀达到稳态时其表面氧化膜具有一定的组成和厚度；
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