单项选择题
A.100m±0.5m B.150m±0.5m C.200m±0.5m D.250m±0.5m
A.1~50 B.1~60 C.1~80 D.1~100
A.1~6 B.1~25 C.1~7 D.1~20
A.1 B.2 C.3 D.4
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