A maritime performing party is subject to the obligations and liabilities imposed on the carrier under this Convention and is entitled to the carrier's defences and limits of liability as provided for in this Convention if:
(a) 海运履约方在缔约国为运输而接收了货物或者在缔约国交付了货物，或者在缔约国某一港口履行了与货物有关的各种活动；并且