保护期限为20年的知识产权是( )。

根据《商标法》规定，商标权的保护期限自注册之日起（）年。

招标人应当在招标文件中载明投标有效期。投标有效期从（）之日起算。

简述知识产权的范围，并论述保护知识产权的重要性和保护知识产权的措施。

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。

承兑汇票付款期限从承兑汇票承兑之日起至到期之日止，最长不得超过（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。