题目内容
When the eruption was over, Pompeii was buried under 20 feet of ____rock and ash.
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In 1748, an Italian farmer digging on his farm uncovered part of a wall of the____city of Pompeii.
Soon, ____began to dig in the area.
Today, tourists come from all over the world to see the____of the famous city of Pompeii.
在等温下，在经过不同等外压过程从相同始态膨胀到相同终态，分成的等外压过程次数越多，对外所作的体积功就____。
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