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什么叫正向产生式系统？什么叫反向产生式系统？它们各自适合于怎样的实际问题？
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女性，30岁，乏力、活动后心慌1年余。查体眼结膜、口唇苍白，心率110次／分，心尖区可闻Ⅱ级收缩期杂音，化验检查：血红蛋白60g／L，平均红细胞血红蛋白浓度0．25g／dl，平均红细胞体积为70m3。血清铁6．2μmol／dl，血清转铁蛋白饱和度10％，总铁结合力3690／μmol／L。最可能的诊断是（）
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保持铁口能与炉缸上部贯通，是中修与闷炉（封炉）开炉时对炉前操作要求之一。
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简述基于CMM评估的内容、评估过程和评估模型。
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吸烟管理制度是什么？
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Asking Seller to Cover Insurance for 150% of the Invoice Value Dear Sirs, We are pleased to advise you that concerning your S/C No．819 for 500 sets color TV, we have issued confirmed, irrevocable L/C No．919 for US ＄50 000, through the Bank of China, London, valid to October 20. Please see to it that the goods are shipped before 20th October and the insurance is to be covered for 150% of the invoice value against All Risks．We know that according to your usual practice, you insure the goods only for the 110% of the invoice value, therefore, the additional premium will be for our account. Please arrange the insurance accordingly and inform us your shipment date after closing the insurance.Yours faithfully,
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国内业务文件、资料和专用工具书短缺时，应（）。
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与祛风湿药"祛风湿、止痹痛"功效相关的药理作用是（）
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广义的医务人员之间的关系是（）。
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109分配阀主阀部主勾贝在初制动位时，沟通的气路是（）。