某些设备中的滤油板、滤渣板、消音板(或消音管),都稠密地分布了大量的小孔。这些小孔的分布形式常见于下列两种(取相邻的两行两列之四孔来分别,即得到两种形式):一、四孔中心分布于矩形的四个顶上,如图1·a之细实线方框所示,称这种孔板为矩形式密布孔板,二、四孔中心分布于菱形的四个顶点上,如图1·b所示,则称这种孔板为菱形式密布孔板。图1·b为某型号摩托车上消音管所用的孔板。 Some equipment in the oil filter board, filter residue board, silencer board (or silencer), are densely distributed a large number of small holes. The distribution of these holes is common in the following two (take four adjacent two rows and two columns to get the two forms, respectively): one, four-hole center distributed on four rectangular top, shown in Figure 1 · A thin solid line box, said the orifice plate is a rectangular pattern of dense orifice plate, two or four holes centered on the diamond four vertices, as shown in Figure 1.b, then said such holes Plate for the diamond-shaped plate. Figure 1 · b for a model motorcycle sound-absorbing tube orifice plate.