假定汉堡包与炸薯条之间的需求交叉弹性为负值，那么（）

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

Demand curve（or demand schedule） 需求曲线（或需求表）

社团注册时间为每学年第一学期开学后（）内。

关于2017—2018学年第一学期学风建设工作报告

自费留学人员购买第一学年或学期的学费，持（）办理。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。