单项选择题
A.55mm B.57mm C.60mm D.65mm
A.500kpa B.600kpa C.1000kpa D.1500kpa
A.REL、APP两个电磁阀均失电 B.REL得电、APP失电 C.REL、APP两个电磁阀均得电 D.REL失电、APP得电
A.制动波速 B.制动波 C.空气波速 D.空气波
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