A valve is a device that regulates the flow of a fluid -LRB- gases , liquids , fluidized solids , or slurries -RRB- by opening , closing , or partially obstructing various passageways .
Flow
Flow
이 문장을 더 간단한 방식으로 다시 작성하십시오: A valve is a device that regulates the flow of a fluid -LRB- gases , liquids , fluidized solids , or slurries -RRB- by opening , closing , or partially obstructing various passageways . 산출: