The new cross spectral energy method(CSEM)is proposed for maintaining cable-stayed bridge safe-ty by the measurable out......

通过文献资料法,调查访问法及数理统计法对293名已退役的可测量项目优秀运动员进行退役年龄特征分析及退役致因分析,结果得出:我......

通过对黄缘盒龟体重、背甲长、背甲宽、腹甲长、腹甲宽、体高等可量性状和背甲长／背甲宽、腹甲长／腹甲宽、背甲长／腹甲长、背甲宽／腹甲......