Analysing the accident examples in this paper shows that earth connection is necessary and some earthed methods exist limitations for fire-proof and explosion-proof.
本文通过对事故实例的分析，指出接地的必要性和几种接地方式在防火、防爆方面的局限性。
2
The properties, production technology and classification of single-piece of fire-proof glass are described in this paper.