---___________. The woman sitting here has just left.
如图所示,A弹簧测力计对B弹簧测力计的拉力和B弹簧测力计对A弹簧测力计的拉力关系是____,如果A弹簧测力计的示数是3.6N,则B弹簧测力计的示数是____ N.