在pH为10.0的氨性缓冲液中,以0.01 mol/L EDTA 滴定同浓度Zn2+溶液两份。其中一份含有0.2 mol/L 游离NH3;另一份含有0.5 mol/L 游离NH3。在上述两种情况下,对pZn\'叙述正确的是 ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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