pKa是指() ["A.药物解离度的负倒数","B.弱酸性或弱碱性药物引起50%最大效应的药物浓度负对数","C.弱酸性或弱碱性药物在解离50%时溶液的pH值","D.激动剂增加1倍时所需的拮抗剂对数浓度","E.激动剂增加2倍时所需的拮抗剂对数浓度"]
怎样写好主诉?
易出现首关消除的给药途径是() ["A.肌内注射","B.吸入给药","C.胃肠道给药","D.经皮给药","E.皮下注射"]
吸收较快的给药途径是() ["A.透皮","B.经肛","C.肌内注射","D.皮下注射","E.口服"]
主诉
怎样描写简要现病史?