Enter a value to set the operating clearance area around the shape.
输入一个值，设置该形状周围的操作净空面积。
Drill press. Dimensions and operating clearance area can be specified.
钻床。可以指定尺寸和操作净空面积。
So that the valves can close fully some clearance is needed in the operating mechanism.
所以阀门能完全关闭，气门间隙在操作机构内是必须的。
So that the valves can close fully some clearance is needed in the operating mechanism.
所以阀门能完全关闭，气门间隙在操作机构内是必须的。
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