鉴定白喉杆菌产毒株的简便方法是()
A.锡克试验
B.Elek平板试验
C.过氧化氢酶试验
D.鸡蛋斜面培养基生长试验
E.亚碲酸钾血平板上菌落鉴定
参考答案:B
共轭效应造成碱性不同的是( )
A.东莨菪碱<莨菪碱 B.顺-10-羟基二氢去氧可待因>反-10-羟基二氢去氧可待因 C.小檗碱>吗啡 D.秋水仙碱<吗啡 E.麻黄碱>去甲麻黄碱
______ and ______ are distinguished by whether the learner of a second language pays conscious attention to the rules of the target language.
A. Learning, acculturation B. Learning, acquisitionC. Acculturation, accommodation D. Acquisition, accommodation