[单选] No jettison of cargo shall be made（）as general average unless such cargo is carried in accordance with the recognized custom of the trade.

长途通信电缆线路径路复测包括哪些内容？ 风机盘管主要有哪几部分组成？ Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（） Close radial clearance between impeller hub and casing。 Low rotational speed of impeller。 Removable end plate。 Replaceable impeller and casing wearing ring。 LSAck报文是对下列哪种OSPF报文的确认（）。 HELLO报文（Hello Packet）。 DD报文（Database Description Packet）。 LSR报文（Link State Request Packet）。 LSU报文（Link State Update Packet）。 《八十天环游地球》中福克先生从不挥霍浪费，是个小气吝啬的人。 No jettison of cargo shall be made（）as general average unless such cargo is carried in accordance with the recognized custom of the trade.