单项选择题
A.18mm B.20mm C.22mm D.24mm
A.12MPa B.15MPa C.20MPa D.25MPa
A.连接套 B.堵塞器 C.钢体 D.偏心孔
A.17/8TBG B.27/8TBG C.37/8TBG D.47/8TBG
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