尺寸线在平面制图中，画在两尺寸界线之间，是为了标注尺寸而单独绘制的线段，上方标有数值，一般用细实线绘制，以用表示所注尺寸的方向。
带自动匹配长度的标签的尺寸线。
Dimension line with label that automatically changes to match length.
带自动匹配长度的标签的尺寸线。文本位置和延长线是可调整的。
Dimension line with label that automatically changes to match length. Text position and extension lines are adjustable.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
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