围术期预防应用抗生素的指征不包括() ["肠道手术","开放性创伤手术","器官移植手术","患者年龄超过70岁的手术","切口接近感染区域的手术"]
机车车辆限界(v<200km/h)在钢轨水平面上部1250mm~3600mm范围内,其宽度为()。 ["3200mm","3400mm","4800mm","3500mm"]
属于二相性真菌的是() ["白假丝酵母菌","新生隐球菌","曲霉菌","毛霉菌","孢子丝菌"]
什么是天平的分度值?
苯丙氨酸脱氨酶试验阳性的是() ["沙门菌属、志贺菌属、变形杆菌属","埃希菌属、志贺菌属、变形杆菌属","变形杆菌属、普罗威登斯菌属、摩根菌属","变形杆菌属、克雷伯菌属、肠杆菌属","普罗威登斯菌属、摩根菌属、耶尔森菌属"]
用天平的原则是什么?