40根这样的管子组装成一块面板。
Forty of these tubes are then assembled into a single panel.
所述两块面板的外侧分别设置有网格布。
The outer sides of the two panels are respectively provided with grid cloth.
注：每一块面板清晰显示三相五线制电源的母线、支线。
Remark: every wire of the three-phase five-wire system is clearly indicated on the front panel.
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