Zinc copper intermetallic compounds are the rare native alloy minerals composed of zinc and copper elements.
2
直角坐标方程与极坐标方程的互化是学习解析几何易出错的地方之一。
Right Angle coordinate equation and polar coordinates equation mutually melt is one of places easy to make mistakes in studying Analytic geometry.
3
古人变化观念体现在异类间互化、无生命物与有生命物间互化、人与异类之间的变化。
The changing concept of the ancients was materialized in the exchanging between the other species and species, between nonlife and life, between human and the other species.
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