请注意看那些不大的接触区域(齿牙上暗灰色的点)。
Notice the small area of contact (dulled gray spot on tooth).
它由砂轮的转速及接触区域的液体薄膜的厚度决定。
The value is determined by the grinding wheel speed and the fluid film thickness within the contact zone.
在测试时流过接点的电流过大也能使接触区域发生细微的物理变化。
Excessive current through the contacts during testing can cause a physical change in the contact area on a microscopic level.
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