16.范围经济（economies of scope）是是由于共享而扩大规模，使单位产品各种活动成本下降所带来的经济效益。

A．all large passenger vessels
B．freighters of more than 300 GT in coastal waters
C．all passenger ships and cargo ships engaged in international voyages
D．all passenger ships and cargo ships of 300 GT upwards in international voyages