预应力混凝土枕木用来替代传统的木质枕木并已通过了试验。

Pre-stressed concrete sleepers that have been designed to replace the conventional wooden ones have been tested.

youdao

预应力混凝土枕木用来替代传统的木质枕木并已通过了试验。

Pre-stressed concrete sleepers that have been designed to replace the conventional wooden ones have been tested.

youdao