Look, the outside circle tilted inwards as it went up and became the wall which is.
大家请看外环楼的墙体,他是随着高度的增加渐向内倾斜,形成下大上小、向心力强的墙体。
It is the outside circle (tooth tip circle) of the external spline or the root circle of the internal spline.
它是外花键的外圆(齿顶圆),和内花键的齿根圆。
Or bearing crack, inside and outside circle chipped or bearing excessive wear when, should replace new bearing.
或轴承有裂纹、内外圈碎裂或轴承过度磨损时,应更换新轴承。
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