单项选择题
A.0.1 B.0.3 C.0.5 D.0.6
A.0.5~0.8 B.0.6~0.8 C.0.7~0.8 D.0.8~0.9
A.橡胶垫板B.承轨台C.钢轨承座D.制动轨
A.160 B.170 C.180 D.195
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