... traction shovel 牵引式挖土机,牵引铲... traction thrust 推挽力 electric traction 电力牵引 ...
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Precise conversion of force to pressure requires the force to act vertically and centred on the piston which must not be exposed to any other forces of thrust or traction.
从压力到压强的精确转换要求力垂直集中作用在活塞上。同时活塞也不能受到的拉力或压力。
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