研究也表明，接触状态对结构拓扑有一定影响，不同初始接触间隙可能导致不同的拓扑结构。
It shows that the contact conditions has an effect on structural topology, and different initial contact gaps may lead to different structural topologies.
当垂直刀架下降时，由于摩擦力阻碍其下降，使丝杆的上螺旋面螺母的下螺旋面相接触，丝杆螺母的间隙在下面。
When the vertical turret decline, due to friction hinder its decline, the screw on helical screw nut under the physiognomy contact screw nut in the space below.
按下喇叭开关，如果喇叭有时响，有时不响，多是喇叭开关内部的触点接触不好，使用时间过长，触点间隙增大。
Press the horn switch, if the speaker sometimes ring, sometimes not ring, more than the inner contact of the switch is not good, the use of too long, the contact gap increases.
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