... closed center valve起落机中间位置封闭的阀(方向阀);闭中心阀 closed crossover valve正遮盖的换向阀 closed exhaust valve起落机密闭排气阀 ...
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... closed center valve 中间位置关闭的阀(方向阀); 闭中央阀 closed crossover valve 正遮蔽的换向阀 closed exhaust valve 密闭排气阀 ...
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closed d crossover valve 正遮盖的换向阀
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