Unplug the jack carefully examined, D-type socket pin bends whether or Broken Needle?
拔下插口仔细检查，D型插口中是否有弯针或断针？
A needle valve with a threaded spindle is unscrewed to open a passage for the liquid to escape to the reservoir from the cylinder when the jack is required to be lowered.
当千斤顶需要下降时，一个带锭子的针型阀门被放松来使液体通过圆筒流回储备液箱。
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