We address one aspect of the treatment of technical change in the environmental economics literature: how technical change impacts the marginal cost of abatement. We review a selection of papers that employ a variety of representations of technical change, and show that these representations have quit...
摘要 目的探讨p21ras在肝细胞癌(HCC)中的表达及意义.方法采用免疫组织化学法检测分析10例正常肝组织及81例HCC癌旁肝组织和癌组织中p21ras蛋白的表达.结果①正常肝组织中p21ras无阳性表达;而在癌组织与癌旁组织则出现阳性表... 关键词癌 / 肝...
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Mouth piece for a vacuum cleaner device, and vacuum cleaner device The invention relates to a mouth piece (1) for a vacuum cleaner device, comprising a mouth piece body part (2) and a supporting wheel (3) rotatably mounted to said body part (2) such that said body part (2) can be...