2022 英语周报 八年级 新目标 46答案

第二节书面表aiting for you to explore. Besides, the exceptional PekingDear JackOpera performances there are also whatam so pleased to learn that you are to spertimerecommend you stay in Beijing, the capital and cul-cerelytural center of China. The city enjoys a high reputation forits abundance of ancient architecture, which represents thetraditional local lifestyles. And there

19.C【解析】水蒸气蒸馏法是植物芳香油提取的常用方法,适用于提取玫瑰油、薄荷油等挥发性强的芳香油;对于柑橘、柠懞等原料易焦糊或有效成分易水解的可采用压榨法;蒸馏法提取楨物有效成分时,蒸馏时的许多因素都会影响产品的品质,如蒸馏温度太高、时间太短.产品的品质就比较差,为了提高产品的品质,需要严格挖制蒸馏温度和时间:提取玫瑰精油和橘皮精油的实验流程中都需用分液漏斗将油层分离出来。故选C。

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