全塑外壳，完全密封，无外加螺钉，无需接地线路。

Plastics cover, completely enclosed, without screws, requires no earth grounding.

youdao

全塑外壳，完全密封，无外加螺钉，无需接地线路。

Plastics cover, completely enclosed, without screws, requires no earth grounding.

youdao