The calculation about the area of filling-in and excavation of canal cross section is the basic work in earthvolume of the canal designing.
渠道断面填挖面积计算是渠道设计中的填挖土方量计算的基础工作。
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That core, calculation suggests, takes up around 60% of the planet's volume, making it far larger than the cores of Venus, Earth and Mars, the solar system's other rocky planets.