Internal exhaust valve increases down stroke speed.
内部排气阀增加下冲速度。
Deformation of helical buckling appeared on rod during down stroke is also analyzed.
同时分析了下冲程抽油杆所产生的螺旋弯曲变形。
This technique eliminates the tube in conventional mechanical lifting, takes hollow rod as the transmission medium and oil flow channel and discharges fluid during down stroke.
该项工艺省去原机械举升中的油管，利用空心杆作为传动介质和油流通道，下冲程挤压排液。
With good kicking technique, you can bend your knee a little on the down stroke but this shouldn't be a 'driven' movement, it's just a slight movement from a relaxed knee.
好的打腿技术，在你下压的时候膝盖稍微有些弯曲，但是并不大，只是膝盖放松的后果。
With good kicking technique, you can bend your knee a little on the down stroke but this shouldn't be a 'driven' movement, it's just a slight movement from a relaxed knee.
好的打腿技术，在你下压的时候膝盖稍微有些弯曲，但是并不大，只是膝盖放松的后果。
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