... trap rock 黑色火成岩 trap screw 螺旋栓 trap window 活板窗 ...
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trap screw WESTBANK 螺旋栓
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Turning adjustment screw to change the height of the trap door open in order to adjust the volume of high-pressure gas through the pressure to achieve the required value.
转动调节螺杆，改变活门开启的高度，从而调节高压气体的通过量并达到所需的压力值。
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