交付= 受領?- 論承攬人之「交付」、定作人之「受領」與危險移轉、同時履行抗辯、物之瑕疪擔保間之關係

Is performance equate receipt of performance? -A study on the relationship between the independent contractor's performance, the employer's receipt of performance and the risk assignment, the concurrent performance defense, and the implied warranties