英文缩写是“SD”，是“Standard Dimension ”的缩写，意思是标准尺寸
Generally production on the standard dimension, if there is special need, we could also make for them.
英文缩写是“SD”，是“Standard Dimension ”的缩写，意思是标准尺寸
Generally production on the standard dimension, if there is special need, we could also make for them.
