【简答题】计算0.10mol∙L -1 NH 3 ·H 2 O溶液的pH值等于 。已知:NH 3 ·H 2 O的p K b = 4.74。
【单选题】某投资方案折现率为16%时,净现值为6.12,折现率为18%时,净现值为-3.17,则该方案的内容报酬率为( )。
【简答题】Jiaodong Cuisine is renowned for fresh seafood with light taste while the ______________ is particularly well-known for its well-chosen ingredients and elegant shaping of the dishes.
【多选题】SHandong cuisine ________ Ji'nan cuisine and Jiaodong cuisine.
【单选题】五味子、忍冬、马兜铃、何首乌等植物的茎按照生长习性为( )。
【简答题】在0.10 mol∙L – 1 NH 3 ∙H 2 O溶液中,加入NH 4 Cl固体,则NH 3 ∙H 2 O的浓度____,解离度____,pH值____,解离常数____。