A确保流经管路的液体没有气泡。
B确保管路渗漏出的油液没有气泡。C确保液压油通过管路，且没有产生气泡。
Make sure that the fluid that goes through the tube has no bubbles.
MAKE SURE THAT THE FLUID INDICATOR LIGHT ( ).
make sure that there is no blockage in the pipe.
Make sure that you can see the oil level through the sight gauge.
MAKE SURE THAT THE SPEEDBRAKE RETRACTS IMMEDIATELY.
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