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采用土回填时，槽底至管顶以上500mm范围内，土中不得含有机物、冻土以及大于（）mm的砖、石等硬块。
简述学校事故的特征。
人工智能的发展趋势包括（）。
开放式基金和封闭式基金一样，都可以在二级市场上自由交易。
女性，19岁，幼年有气喘史，3d前受凉后出现喘息、咳嗽，口服氨茶碱、吸入糖皮质激素和沙丁胺醇后无缓解，并出现焦虑不安，言语不成句。体检：血压135/80mmHg，呼吸28/min，脉搏135/min，双肺可闻及哮鸣音，吸入沙丁胺醇后PEF占预计值的48%，动脉血气PaO258mmHg，PaCO242mmHg，pH7.38，X线胸片示两肺透亮度增加，痰革兰染色未见明显异常。如果患者经上述治疗后仍未见改善，下列哪种原因最不可能（）
有关电动势的叙述中，下列说法正确的是（）。
生产计划包括生产技术准备计划、生产计划与（）计划。
青霉素V钾的鉴别反应不包括（）
下列不是造成牙槽骨吸收速度快的原因的是（ ）。
黄连阿胶汤证与栀子豉汤证比较，错误的是（）
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