电路板往往被置于从电气上控制继电器开路和闭合的设备上。
The boards are often placed in a mainframe that electronically controls the opening and closing of the relays.
在设备闭合高度有限的情况下，设计了1副结构新颖的组合式挤压模具，使3150 kN油压机设备能力得到了有效的发挥。
A combined extruding die of new structure was designed to bring 3150kn oil press into its full play under the condition of limited shut height.
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