第 20: 20已知:Ksp,AgCl=18×10-10,Ksp,Ag2CrO4=11×10-12在等浓度的CrO42-和Cl-的混合溶液中,逐滴加入AgNO3时: ( )
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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