单项选择题
A.1000mmB.1100mmC.1200mmD.1300mm
A.40mm*30mm*3mmB.40mm*40mm*4mmC.50mm*40mm*4mmD.50mm*50mm*5mm
A.≥40mm*30mm,壁厚3mmB.≥50mm*30mm,壁厚3mmC.≥60mm*30mm,壁厚3mmD.≥80mm*30mm,壁厚3mm
A.80mmB.90mmC.100mmD.110mm
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