若一个项目的建设能为社会作出净贡献，是指(  )。

社会保障体系包括：社会救济、（）、社会福利、社会优抚等社会保障系统，各系统又包括不同的保障项目。

社会保障体系包括：社会救济、（）、社会福利、社会优抚等社会保障系统，各系统又包括不同的保障项目。

什么是“生活教育”思想？陶行知在教育实践方面作出过哪些贡献？

社会保障的主要内容包括社会救助、社会保险与社会优抚三大部分。（）

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。