4下列几种一元弱酸:HAc(Ka = 175×10-5),HCOOH(Ka = 18×10-4),HCN(Ka = 62×10-10),HF(Ka = 63×10-4),HClO(Ka = 39×10-8)中,酸性最弱的是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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