题型:填空题 He hasn't slept at all for three days. _____ he is tired out. [ ]A. There is no point B. There is no need C. It is no wonder D. It is no way 查看答案
题型:填空题 药物的pKa是指______。A.各药物的pKa不同B.是弱酸性药物在溶液中50%离子化时的pH值C.与pH的差值变化时,药物的离子型与非离子型浓度的比值的相应变化D.pKa大于7.5的药物在胃肠道呈离子型E.pKa小于4的药物在胃肠道呈离子型 查看答案