Small corner in the pipe line or permitted under conditions of constant use of natural elbow.

在管道线路转角较小或条件容许的情况下常采用自然弯管法。

youdao

Small corner in the pipe line or permitted under conditions of constant use of natural elbow.

在管道线路转角较小或条件容许的情况下常采用自然弯管法。

youdao