单项选择题
A.较低一端 B.中间 C.较高一端 D.车站一端
A.80mm*80mm*5mm B.80mm*80mm*8mm C.110mm*110mm*5mm D.110mm*110mm*8mm
A.18mm B.20mm C.22mm D.24mm
A.1h B.2h C.3h D.4h
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