4-methyl pyridine造句

"4-methyl pyridine"是什么意思   

例句与造句

  1. Amino - 3 - nitro - 4 - methyl pyridine
    甲基嘧啶
  2. It's difficult to find 4-methyl pyridine in a sentence. 用4-methyl pyridine造句挺难的

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