The authors put forward a theory of "four-stages"in mature period of preserved eggs, i.e. hydrade stage, solidifying stage, basic mature stage and afterripening stage.
者经试验研究,提出了一种皮蛋成熟的“四阶段”理论。
化;体化
;凝;
点The authors put forward a theory of "four-stages"in mature period of preserved eggs, i.e. hydrade stage, solidifying stage, basic mature stage and afterripening stage.
者经试验研究,提出了一种皮蛋成熟的“四阶段”理论。
A foamable phenolic resin was prepared,through addition,condensation,in the presence of alkali.The resin was foamed with surfactant, foamer,solidifying agent , then the foam phenolplast was given .
苯酚与甲醛在碱性条件下经加成、缩合制得可发性酚醛树脂，该树脂和表面活性剂、发泡剂、化剂一起发泡即得酚醛泡沫塑料。
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