单项选择题
A.联锁机故障 B.区段故障 C.单元台故障 D.鼠标台故障
A.STD—01,STD—01 B.STD—01,RS422 C.STD—01,PC—01 D.RS422,PC—01
A.无极 B.偏极 C.有极 D.缓放
A.1550 B.1650 C.1750 D.1850
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