本章对两种美国高压三柱塞泵的结构和材料选用作了介绍。

This paper presents the construction and the material selection of two kinds of the u.

youdao

本章对两种美国高压三柱塞泵的结构和材料选用作了介绍。

This paper presents the construction and the material selection of two kinds of the u.

youdao