But, head slab cleanliness is seriously deteriorated by the unsteady casting condition at casting start stage.
但连铸开浇阶段由于浇铸状态的不稳定，会严重恶化头坯洁净度。
Requirements concerning the criterion of transient unsteady state conduction during the process of entering the stage of normal condition are quite different as they appear in various literature.
对瞬态不稳态导热过程进入正常情况阶段的判据，不同的文献中有不同的要求。
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