A.自动信号 B.听觉信号 C.机车信号 D.无线信号
A.800m B.1000m C.1200m D.1500m
A.1 B.2 C.3 D.4
A.0.2mm B.0.22mm C.0.25mm D.0.35mm
A.60 B.90 C.105 D.105-165
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