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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.
以己二酸為原料,經(jīng)酯化反應(yīng)和酰胺化反應(yīng)(以氫氧化鉀為催化劑),制備了四羥乙基己二酰胺,探討了催化劑、反應(yīng)溫度和反應(yīng)時(shí)間對(duì)產(chǎn)品收率和羥值的影響。
thead gauge
螺紋規(guī)
thead pitch gauge
螺距規(guī)