采石场;
The annual mean ground temperature at the middle of the closed ballast pit ( at the depth of 0.70m) is-1.60 ℃, which is 1.4 ℃ lower than that at the same depth beneath the gravel surface.
道碴坑中部(0.7m深度处)年平均地温为-1.60℃,比卵石地表相同深度地温低1.4℃。
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