Different volume fractions of propolis extracted with alcohol and citric acid were used to make solution for queen larvae preservationtest.
采用不同体积分数的蜂胶乙醇提取物和柠檬酸配制成保鲜液,进行蜂王幼虫保鲜试验。
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Liu also said the excavation will testpreservation technology that the museum has spent decades developing to keep the undiscovered terracotta figures intact and retain their original colors.