独特的橙色手柄可以远距离指示“启闭”和流体方向。

Distinctive orange handle indicates "open/close" and direction of flow at a distance.

youdao

独特的橙色手柄可以远距离指示“启闭”和流体方向。

Distinctive orange handle indicates "open/close" and direction of flow at a distance.

youdao