单项选择题
A.30m B.20m C.15m D.8m
A.1mm B.2mm C.3mm D.5mm
A.0.15m B.0.3m C.1.3m D.1.8m
A.BLV-1*2.5 B.BV-1*1.5 C.BV-1*2.5 D.BX-1*1.5
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