汽车在规定的使用条件和规定的时间内，完成规定功能的概率，称汽车的（）
血清中不可能存在的天然抗体是（） ["抗A","抗B","抗Cw","抗D","抗E"]
肝脓肿病人最常见的体征是（） ["局部腹肌紧张","局部皮肤红肿","右上腹饱满","肝区压痛","黄疸"]
输注由400ml全血制备的红细胞一般可使成人Hb提高（） ["5g/L","10g/L","15g/L","20g/L","25g/L"]
肠扭转的典型腹部X线平片表现为（） ["多处液气平","膈下游离气体","马蹄状巨大的双腔充气肠袢","鱼刺征","阶梯征"]
我国可作为然来哦经济性评价指标的是（）
