Forward needle valve positions for easy access.
针形阀位置提前，便于接近。
The reference opinion for the selection principle of the proportional valve has been put forward.
对比例阀的选用原则提出了参考意见。
Thus the function of the distance between valve and piston is put forward.
据此提出气门和活塞间距离的函数。
Thus the function of the distance between valve and piston is put forward.
据此提出气门和活塞间距离的函数。
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