Constant wheelchair use will scuff almost any floor surface.任何地板上经常有轮椅走动几乎都会有所磨损。If you scuff ( your feet ) like that, you'll wear the heels out.你那 麽 拖着脚走路, 就要把鞋跟磨坏了.Constant wheelchair use will scuff almost any flo...
它减少了气锁的机会.This reduces the chance of vapour lock.基本装置: 气锁的回转阀,低压大风量机.Basic device: An air - lock rotary valve and a high - volume and low pressure blower.膨胀节是防泄漏的,带有疏水,且与相连的设备之间具有气锁密封性.Expansion joints are leak proof and...