地下矿监，值班班长，或煤矿主管需要省级认证。

Provincial certification as an underground mine supervisor, shift boss, or coal mining supervisor may be required.

youdao

地下矿监，值班班长，或煤矿主管需要省级认证。

Provincial certification as an underground mine supervisor, shift boss, or coal mining supervisor may be required.

youdao