\ue50a梯形螺纹　\ue50b\ue50a2011-02-23　上传　\ue50b\ue50a大小:　\ue50b\ue50a21KB　\ue50b\ue50a　qq332555220　\ue50b\ue50a　qq_31181039　\ue50b\ue50a　qq_27898187　\ue50b