它们根据单位尺寸的道数来分档。

They are classified according to the number of lines of knots per unit of measurement.

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介绍用相位测距仪实现波长标准及在大长度范围内传递长度单位尺寸的情况。

The situations of realizing wavelength standard with phase diastimeter and transmittinglength unit size within a large range are introduced.

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同样，我们对边框的尺寸使用百分数或em单位。

Similarly, we can use a percentage or em unit on a border style dimension.

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