【简答题】A.Robert survived the plane crash. B.All the passengers were killed in the plane crash. C.Robert was killed in the air crash. D.Robert is a wonder-working person.
【判断题】附子和干姜或甘草配伍,可以降低其毒性。()
【单选题】已知H 3 PO 4 的各级离解常数以Ka 1 、Ka 2 、Ka 3 表示,则HPO 4 2 - 作为共轭碱的离解常数为:
【单选题】在H3PO4的Ka1、Ka2 、Ka3 表示式中的[H+]是
【简答题】试计算0.10mol·L-1的H3PO4溶液中H+、H2、和的物质的量浓度(已知H3PO4的Ka1=7.1×10-3,Ka2=6.3×10-8,Ka3=4.8×10计算:0.1mol/L的H3PO4溶液H3PO4,H2PO4-,HPO4 2-,PO4 3-,H+,OH-的平衡浓度?(K1=6.9*10-3 K2=6.2*10-8 K3=4.8*10-13)
【多选题】根据《基金会管理条例》,基金会理事会决议的下列事项中,须经出席理事表决且2/3以上通过方为有效的有( )。
【简答题】A.Robert survived the plane crash. B.All the passengers were killed in the plane crash. C.Robert was killed in the air crash. D.Robert is a wonder-working person.