地堡的混凝土强度
The concrete strength of bunkers
军事地堡用C100，民用的至少要用多少？抗爆差距超乎想象， 专家揭秘：掺入这两种材料，混凝土防护力立刻翻倍
Military bunkers use C100 concrete, so what's the minimum strength required for civilian use? The difference in explosion resistance is beyond imagination.Experts revea
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