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【单选题】
在逻辑无环流可逆调速系统中,逻辑装置有以下工作状态:1检测主回路电流信号为零2检测转矩极性变号3经过“触发等待时间”的延时,发出开放原来未工作的晶闸管装置的信号4经过“等待时间”的延时,发出封锁原来工作的晶闸管装置的信号。请选出以上过程的正确顺序 。A.
①→②→③→④
B.
①→②→④→③
C.
②→①→④→③
D.
②→①→③→④
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