载客电梯和货梯。电梯缆索用冷拔钢丝。规范。

Lifts and service lifts. drawn steel wire for elevator ropes. specifications.

youdao

载客电梯和货梯。电梯缆索用冷拔钢丝。规范。

Lifts and service lifts. drawn steel wire for elevator ropes. specifications.

youdao