由于长期使用继电器触点上接触不良。
The touch points are not firmly connected due to long time usage of relay.
控制器的一个重要功能是提供报警继电器触点。
An essential function of the controller is to provide alarm relay contacts.
每行还通过继电器触点的漏泄电阻和电容耦合到每一列。
Each row is also coupled to each column through the relay contact leakage resistance and capacitance.
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