单项选择题
A.．4mm B．6mm C．10mm D．12mm
A.钢板被剪断 B.螺栓杆弯曲 C.螺栓杆被拉 D.C.级螺栓连接滑移
A.600mm B.584mm C.496mm D.480mm
A.40mmB.64mmC.80mmD.90mm
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