下列各项，属两性离子型表面活性剂的是（） ["卵磷脂","聚山梨酯80","十二烷基硫酸钠","油酸三乙醇胺","十二烷基苯磺酸钠"] 符合交界性期前收缩心电图表现的是（） ["P-R′间期＜0.12s","P′-R间期≥0.12s","P′-R间期≤0.21s","R-R间期≤0.21s","R-P′间期＜0.20"] 下列各项，只可外用的是（） ["砒霜","水银","生藤黄","生附子","生白附子"] 可降低血钾并可以损害听力的药是（） ["苄氟噻嗪","氢氯噻嗪","呋塞米","卡托普利","螺内酯"] 可拮抗醛固酮作用的药物（） ["螺内酯","阿米洛利","乙酰唑胺","氨苯蝶啶","氢氯噻嗪"] 我国就把通过水准零点的（）称为大地水准面。