描述
在梯形图中,要用大量的输入触点符号。设计员应搞清输入信号与“1”和“0”状态的关系。若外部信号触点是常开触点,当触点动作时(即闭合),则输入信号为“1”,若信号触点
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STEAMPUNK ANALOG ELECTRIC DUAL STOP WATCH CLOCK TIMER
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NASA GEMINI FLIGHT INSTRUMENTS ANALOG STOP WATCH TIMER
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