如图所示的应力状态单元体若按第四强度理论进行强度计算,则其相当应力σ r4 等于() https://assets.asklib.com/psource/2015102714254486956.jpg
“因于暑,汗,烦则喘喝,静则多言,体若燔炭,汗出而散”语出:()
接地体若为圆钢,若采用搭接焊接,应双面施焊,其搭接长度为圆钢直径的()倍。
如图所示的应力状态单元体若按第四强度理论进行强度计算,则其相当应力σ r4 等于:() https://assets.asklib.com/psource/2016071912470962093.jpg https://assets.asklib.com/psource/2016071912470721563.jpg