推定的适用要遵循一定的条件及原则。
The application of presumption should follow certain condition and principle.
同时认为适用因果关系推定原则应有原则、条件等限制，并配以具体的方法。
It is pointed out that there are some restrict principles and concrete application methods in using presumption principle of causality.
文章对比了标准养护强度、钻芯强度以及各种推定强度与同条件养护强度的关系。
It contrasts the relation between the strength gotten under the standard curing condition, the strength gotten by drill, some putative strength and the strength gotten under the same curing condition.
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