单项选择题
A.0.3~0.5m B.0.4~0.7m C.0.5~0.8m D.0.4~0.5m
A.20cm B.25cm C.30cm D.10cm
A.0.1m B.0.2m C.0.3m D.0.5m
A.大于 B.小于 C.等于 D.不等于
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