A.书面形式B.口头形式C.默示D.推定
A.Customer Ralationship ManagermentB.Cost Ralationship ManagermentC.Customer Rpublic ManagermentD.Customer Ralationship Manager
两根截面尺寸为b=20cm,h=20cm的木梁相互重叠,左端固定,右端自由。受集中力F=15KN,如图所示。试求:(1)两根梁连接成整体时,梁接缝上的切应力为τ及其剪力Fs等于多少?(2)若两根梁用螺栓连接,螺栓的许用应力[τ]=80MPa,试求螺栓的截面积A?