题目内容
(请给出正确答案)
[单选题]
埋深超过()m的煤层,且煤层上方100m范围内存在单层厚度超过10m的坚硬岩层,应当进行煤层(岩层)冲击倾向性鉴定。
A.100
B.200
C.300
D.400
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A.100
B.200
C.300
D.400
A.400;100;10
B.500;100;10
C.800;200;20
D.1000;400;30
A.400m,100m,10m
B.300m,100m,10m
C.400m,50m,10m
D.200m,50m,10m
A.50m
B.100m
C.300m
D.500m
A.50m
B.100m
C.300m
D.500m