The enhancement effect of slag powder contributes 30% more to cement system than to concrete system.

矿渣微粉在水泥中发挥的增强效应要比在混凝土体系中大，约为30%。

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A composite light cement system is developed to solve the problem of cement loss during cementing in some Wells.

低密度水泥是解决低压易漏井固井水泥浆漏失的主要途径。

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Methods: 14 fractured crown fragments of incisors were immediate reattached using dual-curing resin cement system.

方法：14例冠折上前牙用双重固化树脂粘接系统进行断端即刻再接修复，临床观察1年。

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Given the two red flags that had been thrown up previously, one would have expected that as a precaution a cement plug would have been placed somewhere in the wellbore as a secondary pressure seal before this primary pressure control system (heavy mud) was evacuated from the wellbore.

WSJ: The Oil Disaster Is About Human, Not System, Failure