单项选择题
(A)1~2m (B)1.5~2m (C)2~2.5m (D)2.5~3m
(A)200mm (B)250mm (C)300mm (D)350mm
(A)O~lOmm (B)0~20mm (C)±20mm (D)±10mm
(A)400mm (B)450mm (C)475mm (D)500mm
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