单项选择题
A.1mm B.2mm C.3mm D.4mm
A.5mm B.4mm C.3mm D.2mm
A.15mm B.12mm C.14mm D.13mm
A.黑,红 B.黑,白 C.白,黑 D.白,红
微信扫一扫,加关注免费搜题