文章在介绍煤矿井下作业特点和煤矿井下用产品特点的基础上，论述了国家对煤矿用产品实行安全标志管理的重要性和必要性。

Based on the features of operation and products used in underground coal mines, the author described the importance and necessity of management of safety signs on products of mine use.

youdao

文章在介绍煤矿井下作业特点和煤矿井下用产品特点的基础上，论述了国家对煤矿用产品实行安全标志管理的重要性和必要性。

Based on the features of operation and products used in underground coal mines, the author described the importance and necessity of management of safety signs on products of mine use.

youdao