[问答题] 内毒素与外毒素有何主要区别?

“IV-DSA”插管，通常选() ["A．锁骨下静脉 ","B．肘正中静脉或贵要静脉 ","C．股静脉 ","D．大隐静脉 ","E．小隐静脉"] 瘸原性球菌可致哪些疾病? 主要病原性球菌有哪些? 何谓正常菌群与条件致病菌? 除哪项外均为细胞周期特异性药物() ["A．氟尿嘧啶","B．长春新碱","C．甲氨蝶呤","D．亚硝脲类","E．顺氨氯铂"] 内毒素与外毒素有何主要区别?