题目内容
In-circuit test is to do the physical measurements (i.e. voltage, frequency) , then functional test is to check if the PCB does what it had been designed for.
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ESD prevention may include setting up an ESD safe workstation , using anti-static mats and conductive flooring materials to conduct harmful electric charges away from the work area, wearing conductive garments and conducting wrist straps to prevent high voltages from accumulating on workers’ bodies, using ESD-safe bag to store and transport any ESD sensitive electronic component.
接触轨可靠性高,维修费用低,设计使用期长达( )年,其经济效益不可估量。 ( )
接触轨设备检修周期:( )个月 ( )
根据集电靴从接触轨上取流的方式的不同,接触轨的类型可分为:____________。
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