Since the gas bag is added, the pressure increase within the hydraulic chamber is very slight when the string collar passes through the packing element.
由于增加了气囊，管柱接箍通过胶筒时，液压腔内的压力升高很少。
Since the gas bag is added, the pressure increase within the hydraulic chamber is very slight when the string collar passes through the packing element.
由于增加了气囊，管柱接箍通过胶筒时，液压腔内的压力升高很少。
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