BSC指没有误差，比如1mm BSC，就是指严格的1mm。
BSC是指基本值,其它还有TYP(典型值),REF参考值,单位一般会在资料里说明。有些说是Basic Spacing between Centers，好像都解释得通
bsc似乎只是备注 表示你的两个引角之间不允许有误差的意思巴 如果有误差的话可能引起很多麻烦
BSC的全称是Basic Spacing between Centers（中心基本距离），一般用在说明IC引脚之间的宽度。
Solution 1:
BSC means "Basic Space Between Center".
The "Drawing Requirements Manual" by Jerome Lieblich (W/C is in compliance with Mil Std 100F) defines BSC as a numerical value that is used to describe the theoretically exact size, shape, or location of a feature or datum target; this is shown on drawings enclosed in a rectangle. It is the basis for determining which permissible variations are established by tolerances on other dimensions.
Solution 2:
"BSC" is short for BASIC. It is a numerical value used to describe the theoretical exact size, shape or location of a feature or datum target. It is the basis on which permissible variations are established by tolerances on other dimensions, in notes, or by feature control symbols. Basic dimensions are displayed on the drawing enclosed in a rectangle
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