2. The linchpin to immit the hydraulic oil: when remove the compressing plate down, when the compressing plate moving during the first time, the moving speed will be difference.
注入油量的关健：当压板正常往下移时，压板在第一次移动，移动速度是不均匀的。
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3. The linchpin to immit the hydraulic oil: when remove the compressing plate down, when the compressing plate moving during the first time, the moving speed will be difference.
