短暂性脑缺血发作症状一般不超过多少小时?() ["8h","12h","20h","24h","48h"]
下列属于注册消防工程师职业道德基本规范的是()。 ["团结互助","依法执业","文明礼貌","客观公正","保守秘密"]
左冠状动脉旋支阻塞引起的梗死区域多为() ["左心室侧壁","左心室前壁","左心室后壁","室间隔前2/3","室间隔后1/3"]
为右上肢骨折病人脱、穿衣的方法是()。 ["先脱右肢,先穿右肢","先脱右肢,先穿左肢","先脱左肢,先穿左肢","先脱左肢,先穿右肢","以上都不对"]
属于改善混凝土拌合物和易性的主要措施的是() ["采用合理砂率","改变水泥标号","改变混凝土设计强度","调整水胶比"]
简述急性实验的目的。