A．useB．heatC．pressureD．form

A．useB．usedC．usefulD．usefulness

A．pileB．heatC．powerD．pressure

【C10】A．useB．placeC．viewD．absence

In its simplest form. the pressure reducing valve is opened or closed by _____ which is ba

【C19】A．useB．employC．applyD．utilize

【C19】A．useB．arrivalC．denialD．free