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首先证明了强次亚紧空间的一个逆极限定理；
This paper first prove an inverse limit theorem of strongly submetacompact spaces;
讨论圆周上一类比扩张映射更广泛的连续映射， 证明这种映射是拓扑稳定的， 并且其逆极限系统是可扩。
The present paper shows that a class of continuous maps on circles which is extensiver than expand maps is topological stable.
应用误差逆传播（BP）神经网络方法，对高含沙流体极限剪应力进行了多次训练。
Data of ultimate shear stress of hyper concentration flow are trained several times by Back Propagation (BP) neural network method.
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