Report copyright - 口 平面図 - mlit.go.jp...Tb Wt At Pm An An Ne dt An At Wt Ptf1(上部) Ptf1(下部) Tb Vc Vc Vc Ptf2 Ptf2 Pm Tb dt An C P ③ C P ② C P ① 青ぶな山トンネル避難坑
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