公差这个概念既包括尺寸偏差范围和表 面粗糙度范围， 也包括由热处理和其它处理操 作所引起的机械特性的变化。
Tolerances cover dimensional variation and surface-roughness range and also the variation in mechanical properties from heat treatment and other processing operations.
由于表贴器件制造公差的影响，器件与冷板间的接触热阻无法有效控制。
Because of the influences of such factors as machining tolerance etc., the contact thermal resistance between chip and cold plate can't be controlled effectively.
用于比较测量高精度长度尺寸和形位公差，也可作为高精度测量仪器的指示表。
To measure pinpoint accuracy dimensions and shape; position errors by comparative method , also can be used as indicators of pinpoint measuring apparatus.
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