单项选择题
A.2.45-2.67MPa B.9.8-78.4MPa C.6.77-7.72MPa D.7.72-88.27MPa
A.10mm B.20mm C.30mm D.40mm
A.10－20mm B.20－40mm C.50－300mm D.40－50mm
A.50－300mm B.300－350mm C.350－1200mm D.1200－1300mm
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