[名词解释] 少尿

简述泌尿道感染患儿留取尿培养标本时的注意事项。 如何掌握肾炎患儿的休息问题? 肝移植，供肝的冷缺血时间不宜超过() ["A．2小时","B．4小时","C．6小时","D．8小时","E．10小时"] 影响硬化混凝土强度的主要因素是()? ["水灰比;","单方用水量;","含砂率;","水泥用量。"] 下列哪项不是氧自由基() ["A．H0","B．烷氧自由基","C．一线态氧","D．羟自由基","E．超氧阴离子自由基"] 少尿