题目7单选题
实心圆轴如图所示,已知扭转刚度GIp和γ角,则轴的扭矩及相对扭转角分别为:<img src="https://tihai-oss-cloud.itihey.com/img/fc45422eaf124e8f487cb6ecf705e026.png">A. T=GIpγ/r,φ=lr/γB. T=lγ/(GIp),φ=lγ/rC. T=GIpγ/r,φ=lγ/rD. T=GIpγ/r,φ=γr/l