{
  "text": "此时我们应注意到，托架多路换向阀和支腿多路换向阀的M口各串联一自救阀，如果将该自救阀打开，则在接通取力器时，来自液压泵的液压油便将三通流量调节阀关闭。因此，在实施切换时，还需打开自救阀。",
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