单选题我国标准钢轨长度有()两种。A12.5m及10mB12.5m及25mC12.5m及50mD25m及50m
单选题
我国标准钢轨长度有()两种。
A
12.5m及10m
B
12.5m及25m
C
12.5m及50m
D
25m及50m
参考解析
解析:
暂无解析
相关考题:
判断题钢轨的标准长度有12米和25米两种。A对B错
12.5m及10m
12.5m及25m
12.5m及50m
25m及50m