A.500mm B.800mm C.810mm D.860mm
A.1:1 B.1:1.25 C.1:1.5 D.1:1.75
A.設(shè)置移動停車信號防護 B.當(dāng)即派專人檢修 C.設(shè)置故障防護 D.停機下道進行檢修