Observes the oil flow state of 560 model equipment to judge whether the oil circuit is unobstructed（观察560型号设备油路流动状态，判断油路是否通畅）
油流观察镜
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油流观察镜
详细信息 Observes the oil flow state of 560 model equipment to judge whether the oil circuit is unobstructed（观察560型号设备油路流动状态，判断油路是否通畅）
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