发布时间:2025-02-06 23:10:52
15 N/20mm中的20mm指的是测试时用的胶带宽度是20mm宽度的,你可以根据你实际的宽度算出粘着力.
导管和筛管的相同点都属于组织不同点导管位于筛管位于导管由下往上运输下面还
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