[名词解释] 持续

惟一性标志 医学决定性水平 下列哪项与细菌外毒素测定无关() ["A．Elek平板毒力测定","B．鲎试验","C．LT及sT测定","D．白喉毒素检测","E．肉毒毒素检测"] 甲基红试验中培养基的pH需降至多少，指示剂才指示阳性结果() ["A．2.5","B．5.O","C．4.5","D．6.5","E．7.4"] 实验室认可 持续