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1979年我国公路隧道通车里程仅为52公里/374座,2002年我国公路隧道通车里程已达704公里/1782座,比1979年增长了13倍。
In 1979, the mileage of highway tunnels in our country was only 52 km / 374. In 2002, the mileage of highway tunnels in our country reached 704 km / 1782, an increase of 13 times over 1979.