This paper proposed the reasonable amount and the temperature of adding silica flour after studying the strength retrogression of Romania S_2 oil cement at high temperature.
本文通过研究罗马尼亚s_2油井水泥在高温下形成水泥石的强度衰退规律，提出合理的加砂量并讨论了应加砂的温度范围。
In various jurisdictions, collusive arrangements have been found to exist in homogenous products such as cement, flour, steel and sugar.
在不同的地区，诸如水泥，面粉，钢材，糖等同质产品已经存在共谋安排。
There is often dust pollution in environments of coal mining, cement production, flour processing and pharmaceutical factory etc.
煤矿开采、 水泥生产、面粉加工、制药等行业长期受到粉尘污染的困扰。
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