简单机械知识单元结构设计

I=URR=UI1=11UIUIIIUU11221212=⇒=IRIRIIRR11221221==,SN⎧⎨⎩R=UP2I=URR=UP2=UP2E=W+QW=qU=UIt=ptmv=hv-Wm212Wmv===1212443222F=(F+F)2=225NW=F=2250J12sW112=mvl2W=Fscos30=32FSW=FSCOS60=12Fs34W=mas;ma+mg1+tga3W=E=mg=59.8=49p2222W=mgh=mg12222aba+-()UUnn1212=UUnn1212=IInn1221==cmt-tc=Qmt-t0022=αvvtto-⇒⇒⇒⇒⇒