A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

以下哪个城市是海上丝绸之路的起点？（）

下列不属于“海上丝绸之路”起点的是______。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

南方海上丝绸之路

海上丝绸之路是我国古代对外商品贸易的海上通道，秦汉时期兴起于（），唐代开始东移，宋元时期北移。

试分析“海上丝绸之路”的建立，对我国沿海地区的意义。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。