The paper introduced an automatic level holding device composed of a liquid tank supported by a spring.

介绍一种由弹簧支承液槽构成的自动保持液面高度的装置。

youdao

The paper introduced an automatic level holding device composed of a liquid tank supported by a spring.

介绍一种由弹簧支承液槽构成的自动保持液面高度的装置。

youdao