已知环己烷、 醋酸、萘、樟脑的摩尔凝固点降低常数Kf分别为 6.5, 16.60, 80.25及 173, 今有一未知物能在上述四种溶剂中溶解, 欲测定该化合物之摩尔质量, 最适宜的溶剂是: ( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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