单项选择题
A.2处5尺 B.2处3尺 C.3处3尺 D.3处5尺
A.2mm B.3mm C.4mm D.5mm
A.5℃ B.10℃ C.7℃ D.3℃
A.0.2-0.5m B.0.40-0.6m C.0.4-0.8m D.0.5-1.0m
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