溶菌酶对革兰阴性菌杀菌作用弱,主要是因为
A.无磷壁酸
B.无肽聚糖
C.有外膜保护作用
D.有二氨基庚二酸
E.无脂蛋白
参考答案:C
According to Piaget, thought or thinking has its origin in actions physically performed and then ______. In other words, thought is actions.
芍药汤与白头翁汤两方组成中均含有的药物是()
A.甘草
B.黄芩
C.黄柏
D.黄连
E.大黄