变矩器防倒流单向阀
converter backflow check valve
充油压力单向阀
charge pressure check valve
垂直单向流
vertical unidirectional flow
垂直单向流洁净室
vertical unidirectional air flow cleaning room
vertical unidirectional-flow cleanroom
单流向法
single flow direction algorithm
单向流病房
unidirectional flow treatment unit