单项选择题
A.1 B.2 C.3 D.4
A.180~220mm B.180~200mm C.160~220mm D.160~200mm
A.2~4m B.2~5m C.2~6m D.2~7m
A.0.2m B.0.3m C.1.0~2.0m D.1.0~1.5m
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