单项选择题
A.0.5h B.1h C.2h D.3h
A.0.1~0.2 B.0.2~0.3 C.0.3~0.4 D.0.4~0.5
A.0.5~1.5 B.1.5~2.5 C.2.5~3.5 D.3.5~4.5
A.2~4 B.3~5 C.4~6 D.5~7
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