单项选择题
(A)10~20mm (B)20~30mm (C)30~50mm (D)50~80mm
(A)250mm (B)200mm (C)150mm (D)lOOmm
(A)1~2m (B)1.5~2m (C)2~2.5m (D)2.5~3m
(A)200mm (B)250mm (C)300mm (D)350mm
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