简述“三北”防护林与长江中上游防护林的生态效益。

从治理结构来看,国家治理体系主要包括政治治理、经济治理、文化治理、社会治理、生态治理等五个体系（）

从治理结构来看，国家治理体系主要包括政治治理、经济治理、文化治理、社会治理、生态治理等五个体系。

《成都市加快推进生态文明建设实施方案》，加快构建现代农业产业体系，推动农业向（）、经济型、现代化转变。

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。

简述水土保持防护林的树种特征。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。