ZHONG HUA REN MIN GONG HE GUO JIAN SHE BU ZHONG HUA REN MIN GONG HE GUO ZHI LIANG JIAN DU JIAN YA... profile picture

ZHONG HUA REN MIN GONG HE GUO JIAN SHE BU ZHONG HUA REN MIN GONG HE GUO ZHI LIANG JIAN DU JIAN YA...

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The national standard of the People's Republic of China (GB 50038-2005): civil air defense basement design specification