HBV的抗原成分中哪一种为病毒核心的主要抗原成分?() ["HBvAg","HBsAg","HBcAg","HBeAg","HBuAg"]
关于氨基酸脱羧酶试验错误的是() ["必须加石蜡油封口","氨基酸脱羧后变为碱性物质","试验管和对照管全变紫色为阳性","不同脱羧酶底物不同","细菌所含的脱羧酶种类不同"]
观测误差按性质可分为仪器误差和环境影响误差两类。
盐酸是由下列哪种细胞分泌的?() ["内分泌细胞分泌","壁细胞分泌","颈黏液细胞分泌","主细胞分泌","以上均不是"]
流感嗜血杆菌()。 ["CO2气体环境","厌氧环境","碱性环境","高渗增菌液增菌","生长因子"]
饮食因素与癌症种类的关系。