该测力计曾在生产矿山作了试验，效果良好，达到了预期目的。

This dynamometer has been tested in some produced mines, the result is good, and achieve the expect goal.

youdao

该测力计曾在生产矿山作了试验，效果良好，达到了预期目的。

This dynamometer has been tested in some produced mines, the result is good, and achieve the expect goal.

youdao