单项选择题X 纠错
A.30m B.15m C.50m D.60m
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单项选择题
A.400mm*100mm*5mm B.400mm*40mm*4mm C.500mm*50mm*5mm D.500mm*500mm*5mm
A.10 B.20 C.30 D.50
A.1-5 B.5-10 C.10-15 D.15-20
A.半径的20倍 B.直径的5倍 C.半径的5倍 D.直径的20倍
A.宽边的2倍 B.厚边的2倍 C.宽边的3倍 D.厚边的3倍
A.防腐 B.防潮 C.绝缘 D.绝燃
A.2 B.2.5 C.3 D.3.5
A.50mm*50mm*5mm B.40mm*40mm*4mm C.30mm*30mm*3mm D.20mm*20mm*2mm
A.50mm*5mm B.50mm*4mm C.40mm*5mm D.40mm*4mm
A.1-2 B.2-3 C.3-4 D.4-5
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