The Giant Impact Theory explains many aspects of lunar geology including the size of the Moon'score and the density and isotopic composition of moon rocks.

大碰撞假说能够解释月质学的许多方面内容，包括月球核心的大小、密度、月岩的同位素组分等。

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This paper discussed the relationship between solid content and density of aluminium hydroxide slurry and describes the measurement method and in situ applications of isotopic densitometer.

本文讨论了氢氧化铝料浆的固体含量和密度之间的关系及固体含量的密度检测方法。介绍了同位素密度计的现场应用情况。

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After the culture end and the measurement of the length and density of neural axons, the samples were taken out for isotopic radioactive measurement.

培养结束，测量神经突起长度、密度后，取出标本作同位素放射性测定。

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