The selection of countries in this course is based on ____and ____activities.
____and ____have been left out because there is no ____.
马道的土石方量，需要时按每坑______m3另行计算；
A. 0.4
B. 0.6
C. 0.8
D. 1.0
当冻土厚度______时，冻土层的挖方量，按坚土挖方量进行计算，但应单独统计。
A. ≥300m
B. ≥200m
C. ≥100m
D. ≤300m
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