The dephosphorizing agent containing 20 percent LD slag was optimized by the powder injection experiments in laboratory, the dephosphorization ratio reached 70 percent.

经过实验室铁水喷粉脱磷试验，筛选优化出含20％转炉渣的脱磷剂，脱磷率达70％。

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The more common Lethal Dosage (LD) tests are used to determine the amount of a substance that will kill a predetermined ratio of animals.

通常的致死剂量测试(LD)被用来确定能够一次杀死动物的几率。

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