At the same time, the quality of the Honduras rosin and turpentine were improved by the authors.

 
  • 同時(shí),對質(zhì)量較差的洪都拉斯松香和松節油產(chǎn)品作了改進(jìn),達到中國同類(lèi)產(chǎn)品的特級標準。
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