The destruction of the defending obturation of all kinds of pipelines through walls and floors in civil air defense engineering under explosion shock waves is currently focused on.

爆炸冲击波作用下人防工程各种管道穿墙板构造部位防护密闭性是否受到破坏，是一个值得深入研究的问题。

youdao

Haihua group corporation sincerely welcomes peoples from all kinds of walls at home and aboard to join us in all kinds of business operation with whatever form.

海华集团个人公司竭诚欢迎海内外各界人士以各种形式参与本个人公司的各项业务运作。

youdao

Haihua group corporation sincerely welcomes peoples from all kinds of walls at home and aboard to join us in all kinds of business operation with whatever form.

海华集团公司竭诚欢迎海内外各界人士以各种形式参与本公司的各项业务运作。

youdao