热波
在油品燃烧时,首先是处于表面的轻馏分被烧掉,而剩余的重馏分则逐渐下沉,并把热量带到下面,从而使油品逐层的往深部加热,这种现象称为热波。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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