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常見例句

• Using adipate as a starting material,a new curing agent,tetrahydroxyethyladipicdiamide(THEAD) was prepared by esterification and acylamide reaction with potassium hydroxide as a catalyst.
  以己二酸爲原料,經(jīng)酯化反應(yīng)和醯胺化反應(yīng)(以氫氧化鉀爲催化劑),制備了四羥乙基己二醯胺,探討了催化劑、反應(yīng)溫度和反應(yīng)時間對産品收率和羥值的影響。
• thead gauge
  螺紋槼
• thead pitch gauge
  螺距槼
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