The device was simple, inexpensive and got well field application and was good for popularization.

该装置结构简单，加工成本低廉，现场应用取得良好效果，具有一定推广价值。

youdao

The device was simple, inexpensive and got well field application and was good for popularization.

该装置结构简单，加工成本低廉，现场应用取得良好效果，具有一定推广价值。

youdao