单项选择题
A.0.6m B.0.5m C.0.4m D.0.8m
A.45°～60° B.30°～45° C.25°～30° D.10°～40°
A.25mm×80mm B.20mm×60mm C.25mm×50mm D.20mm×70mm
A.2.0m B.1.8m C.1.5m D.2.5m
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