closed d crossover valve的意思|示意
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closed d crossover valve的网络常见释义
正遮盖的换向阀 ... closed d center valve 中间方位封闭的阀(方向阀); 闭中心阀 closed d crossover valve 正遮盖的换向阀 closed d exhaust valve 密闭排汽阀 ...