修正系统误差有哪些方法?
典型支气管哮喘发作时最主要的临床表现为() ["端坐呼吸,两肺密布中小水泡音","呼气性呼吸困难,双肺哮鸣音","吸气性呼吸困难,双肺哮鸣音","呼气性呼吸困难,两肺散在干湿性啰音","进行性呼吸困难,肺部局限性哮鸣音"]
对肝硬化诊断有确诊价值的检查是() ["X线钡餐检查","腹腔镜检查+活检","胃镜检查","腹部B超","腹部CT"]
肝硬化腹水患者,一般每日进水量宜控制为() ["<500ml","500~1000ml","1000~1500ml","1500~2000ml","2000~2500ml"]
治疗支气管哮喘重度发作使用5%碳酸氢钠能() ["增强呼吸中枢对CO2的敏感性","增强支气管扩张剂的疗效","直接解除支气管平滑肌痉挛","增加血环磷酸腺苷的浓度","抑制磷酸二酯酶"]
修正值与系统误差估计值有什么关系?