design of a friction pair between the vane tip and the stator inner surface is a technical key problem for the design of high-speed vane pumps.
旋板端部与定子内表面间的摩擦副设计是高速旋板泵设计的技术关键。
to provide reliable data communication which can meet the requirements of real-time control is a technical key problem when two-leve microcomputer control is put into action.