单孔，双孔及多孔可供选择。
著名的杨氏实验最初是用双孔，就像两个相干点源一样。
In Young's famous original experiment there were two pinholes, something like two coherent point sources.
具有双孔截面的铝合金挤压管的断面形状满足几何相似定律。
The geometrical similarity law in cross section was satisfied for the aluminum extruded tubes with a double hollow section.
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