可逆风机在正向与反向送风时，都希望具有良好的气动性能。
A reversible axial flow fan is required to run with high aerodynamic performance both in forward direction and in backward direction.
并对正向与反向混合成形的后板模具结构、成形工艺原理给予重点阐述。
Furthermore, the backboard die structure and forming technology principle of forming by combining positive and inverted directions are stated in emphasis.
采用正向推理与反向推理相结合的方法，开发了用于挤压工步分析专家系统的混合控制策略。
A method of hybrid inference based on forward inference and backward inference strategies is achieved in designing extrusion step analysis expert system.
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