Thereby difficult problem that we test relaxation ratio of prestressed concrete steel wire for 1000 hours has been solved.

此法成功地用于生产中，从而解决了预应力钢丝1000小时松弛率检验的难题。

youdao

Now the method is successfully used in the production. Thereby difficult problem that we test relaxation ratio of prestressed concrete steel wire for 1000 hours has been solved.

此法成功地用于生产中，从而解决了预应力钢丝1000小时松弛率检验的难题。

youdao