SS7C7C型电力机车转向架构架四角高度差不大于()。A、5mmB、6mmC、7mmD、8mm
SS7C7C型电力机车转向架构架四角高度差不大于()。
- A、5mm
- B、6mm
- C、7mm
- D、8mm
相关考题:
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