对一定质量的理想气体进行等温压缩.若初始时每立方米体积内气体分子数为1.96×1024,则当压强升高到初始值的两倍时,每立方米体积内气体分子数应为___。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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