It is discovered through experiment that treating PECHs with different relative molecular mass should use different extraction solvents.
实验表明，处理不同相对分子质量的PECH，应采用不同的萃取溶剂。
It is discovered through experiment that treating PECHs with different relative molecular mass should use different extraction solvents.
实验表明，处理不同相对分子质量的PECH，应采用不同的萃取溶剂。
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