Date: Sat, 31 May 2014 01:57:31 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--FD21BAB8B3C7F7F606BAF0941092084A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
Date: Sat, 31 May 2014 01:57:31 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--FD21BAB8B3C7F7F606BAF0941092084A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
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Date: Sat, 31 May 2014 01:57:12 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--560FF65C10D8CEA51ABCE2D714D5D4F9_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
自然界的水都是混合物吸附1.沉淀:操作要点活性炭表面具疏松多孔的特性有较强的吸附能力.无除去异味色素如何来区分硬水和软水呢蒸馏——给液体加热使它变为蒸气再使蒸气冷却凝聚成液体这种方法叫做蒸馏想一想
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Date: Sat, 31 May 2014 01:58:40 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--E5AC46B81DFCC20E52A82049386D03C0_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
Date: Sat, 31 May 2014 01:58:09 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--5040C1A4A7F4439C4AAC6E3AE158AA2A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
Date: Sat, 31 May 2014 01:58:09 +0800MIME-Version: 10Content-Type: multipart/related;boundary=--5040C1A4A7F4439C4AAC6E3AE158AA2A_MULTIPART_MIXED;type=textX-MimeOLE: Produced By Mht File Maker v1
九年级人教版化学第四单元《自然界的水》测试题(测试时间60分钟 满分80分)一选择题(每题只有一个选项符合题意每小题1分共20分)1普鲁卡因(化学式是C13H20O2N2)是一种止痛药剂下列说法中正确的是…( )A普鲁卡因是由碳氢氧氮四种元素组成的B普鲁卡因中含有氮气分子C普鲁卡因中碳氢氧氮四种元素质量比为13∶20∶2∶2D普鲁卡因的相对分子质量为372元素X核外有11个电子元素
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