石墨和金刚石的标准摩尔燃烧焓分别为-393.7kj∕moL和-395.6kj∕moL,则石墨转变为金刚石反应的标准摩尔焓变为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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