Progranunable para 1 lel interface chip-8255 A produced by Intel can be applied to traffic light managing system.
Intel公司生产的8255A可编程并行接口芯片,可应用于交通灯管理系统.
Ensure the vapor concentration is lower than LEL by 10 %.
保证溶剂蒸汽浓度降至lel值的10%下.
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