阀座密封负载和紧密性与反压力相关.Seating load and tightness is dependent on back pressure.不要安装在可能发生反压力的地方.Do not install where backpressure can occur.止回阀模块结构应该包括内 置 止动限止器,防止由于反压力造成阀瓣磨损.Check module construction shall include built - in ...
It has been apparent that in other areas standards have held up well...显然，这些标准在其他地区执行得很好。She browsed in an up-market antiques shop...她逛了一家高级古董店。Thomas screwed the letter up into a ball...托马斯把信揉成一团。It's hard for the ...