保护数字化作品的方法有（）。

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

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 （）.

将电子商务划分为有形商品交易电子商务和数字化商品交易电子商务的依据是（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述法国经济学家1803年发表著作《政治经济学概论》提出了著名的“市场法则概论”。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。