可能为人体内合成亚硝胺的重要场所的是() ["口腔","食道","胃","小肠","大肠"]
心脏骤停的临床表现有哪些?
N-亚硝基化合物的前体物为亚硝酸盐、胺类和() ["磷酸盐","硫酸盐","硝酸盐","碳酸盐","盐酸盐"]
鱼类腐败可用K值来表示,K≤20%表明鱼体新鲜,K值大于多少表示鱼体开始腐败() ["30%","40%","50%","60%","70%"]
食品腐败变质的鉴定一般采用四个方面的指标包括感官、物理、化学和() ["货架时间","加工方式","微生物","食品性质","病理"]
简述院前急救的原则。