chalk powder是什么意思

用法例句

A study on time－dependent behavior of the North Sea unsaturated chalk;

非饱和白垩压缩变形依时特性的研究

Both the engineering practice and laboratory tests show that structural collapse in petroleum chalk tends to occur during water injection.

工程实践和室内试验都表明 ,油田白垩遇水后极易发生颗粒结构崩溃现象。

The characteristics between calcareous clay and chalk and marlite have been compared in mineral composition and structure etc.

对一种新的非金属矿产———钙土矿的地质特征、矿石特征、物化性能及其在工业领域的应用前景作了介绍，并从矿物组成、结构等方面与白垩、泥灰岩作了对比。