The local poke way will achieve excellent effect.

Improving quality and effect of local ventilation in mine;

Technology of design and application on local ventilation in mine;

The paper intrtroduced some partial ventilation management methods at driving face in coal tunnel.

Overall ventilation in the workshop plus some partial ventilation for welding and painting jobs,as well as special ventilation in some particular cabin wherein work of weld or painting are performed,should be needed.

Devoted to the study on the theory of H-connected space,which has been investigated by Jungck [1] in detail,we first give Jungck’s theorem another proof free from Whyburn [2] ,and then give another theorem in which“compact”hypothesis in Jungck’s theorem is replaced by the locally connected one.

It is proved that if G is conected, locally connected graph on at least three vertices such that the set of claw centers is independent, and if the subgraph induced by the neighbor of v is strong 2-dominated for any claw centre v , then G is fully cycle extendable.

In this paper, we prove that if G is connected, locally connected graph on at least three vertices such that the set of claw centres B is independent, and if G-B is locally connected, then G is fully cycle extendable.