From environmental point of view, the suitable usage field of cement and chemical slurry and the principle of choosing chemical grouting materials are demonstrated.

从环境保护的角度论述了水泥浆材、化学浆材的适用范围及化学灌浆的选材原则。

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Any additional data could be placed in here, but in usage so far, this field is generally left empty.

任何附加的数据都可以放置在这里，但是，在到目前为止的使用中，这个域通常是空的。

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ASCM allows for dynamic spreading factor, thus maximizing link availability, optimizing bandwidth usage and enabling high throughput in the most challenging field and weather conditions.

ASCM允许动态扩展因子，从而最大限度利用链路，优化带宽使用，在恶劣的地形和天气条件下保持高传输容量。

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At the same time, the matters of providing with cooperation of science with practice in the field of usage of underground water become more important.

UNESCO: OFFICE IN TASHKENT

Tablets started off as rugged devices for heavy-duty industrial and field-service usage.

FORBES: What is the Ultimate Ruggedized Mobile Device?