将煤粉与黏土混合制成的煤球比块煤便宜得多。
Mixing clay with coal is much cheaper than burning large blocks of coal.
在白色石灰石和粉灰色石灰石之间是一层薄薄的黏土。
Between the white limestone and the greyish pink limestone is a thin bed of clay.
通过大量正演计算，拟合出桩周土为黏土、砂土、粉土条件下缺陷程度与时域速度响应波形中入射波与反射波波幅比之间的关系式。
Using this software, the relationship between degree of defect and ratio of amplitude was studied, in which the influence of the characteristics of the soil around piles is taken into account.
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