搞好煤矿安全及质量标准化，提高矿井安全可靠性。

If doing well in mine safe and quality level, we can raise mine safe reliability.

youdao

搞好煤矿安全及质量标准化，提高矿井安全可靠性。

If doing well in mine safe and quality level, we can raise mine safe reliability.

youdao