等压线。
同重核；[化] 等压线; 同量异位素(质量数相同)
等压线。
A line drawn on a map or chart connecting places of equal or constant pressure.
恒定压力下的点或状态的集合。
A set of points or conditions at constant pressure.
质量数相同的不同元素的核素。
Either of two nuclides of different elements having the same mass number.
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