比较研究了薄板坯连铸用二孔型水口和四孔型水口流场特征，水模试验结果表明，采用两种水口的薄板坯结晶器流场均存在非稳定性现象。
The characteristics of fluid flow in the mould of two ports SEN and four ports SEN have been compared and the influences of SEN on the level fluctuation are investigated by water modeling experiment.
这表明在小麦的活体花药中也存在花粉二型性现象。
This indicated that the pollen dimorphism also presented itself in the anthers on wheat plants.
这样二次型就包含了零多项式，从而解决了把零多项式排除在二次型外带来的二次型理论中的某些矛盾现象。
As a result, the quadratic form will contain zero - polynomial so that some contradictions in theory on quadratic form caused by excluding zero-polynomial from quadratic form is eliminated.
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