根据人群健康效应谱,从弱到强的5级效应的分布规律是() ["两头大,中间小","两头小,中间大","最弱的效应比例大","最强的效应比例大","都一样大"]
何谓留置导尿术?它的目的是什么?
表证夹痰之脉象是() ["浮紧","浮数","浮滑","洪数","浮缓"]
影响毒物在体内蓄积的因素是() ["毒物在环境中的浓度","毒物的生物半减期","毒物种类","作用时间","以上都是"]
无阈值化合物是指() ["引起急性中毒的毒物","引起慢性中毒的毒物","致敏物","致畸物","遗传毒性致癌物"]
导尿术的注意事项是什么?