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【多选题】
PLC 工作 原理 是( )
A.
周期性顺序扫描
B.
信号集中处理
C.
自我诊断
D.
自动报警
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【判断题】在钢板弹簧销衬套的某一截面上进行测量时,应在这个截面上沿着两个互相垂直的方向来测量尺寸
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