基本解释：可缩拓扑空间
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if X=Πσ∈ΣX σ is |Σ|paracompact,then X is shrinked(with B property or with D property) iff Πσ∈FX σ is shrinked (with B property or with D property) for F∈[Σ] <ω ;2.设X =Πσ∈ΣXσ是｜Σ｜ 仿紧空间 ,则X是可缩的 (具有B性质 ,D性质 )当且仅当 F∈ [Σ]<ω,Πσ∈FXσ 是可缩的 (具有B性质 ,D性质 ) ;2 。
The shrink quantity,theory value and test result of retaining roadways along goaf are the same,this shows the exantness of the mechanics model.可缩量、理论值与现场沿空留巷试验测结果相同,说明了这种力学模型的正确性。
Preliminary study on the tubesheet shaft adaptive structure;管板组合式井壁可缩结构的初步研究
The Acyclicity and Contractibility of Posets;偏序集的零调性与可缩性
Theoretical research and in?situ observation shows the contractibility of the packing doesn′t suitable for the deformation characteristics of roof rocks.理论及现场实测结果都表明 ,目前所用高水速凝材料的可缩性不能很好地适应巷道顶板运动特性 ,必须加以改
