单项选择题
A.60 B.50 C.40 D.30
A.30m≥L≥8m B.30m≥L＞8m C.30m＞L≥8m D.30m＞L＞8m
A.100m≥L≥30m B.100m≥L＞30m C.100m＞L≥30m D.100m＞L＞30m
A.1000m≥L≥500m B.1000m≥L＞100m C.1000m＞L≥100m D.1000m＞L＞100m
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