（2010）设齐次线性方程组 ，当方程组有非零解时，k值为：（）

常用布尔算符有：and、or、not等，当采用同义词进行检索时应当选用的算符是？

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.

齐次线性方程组的基础解系为（　　）。[2011年真题]

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

线性非齐次方程的解与其对应齐次方程的解之和是非齐次方程的解。

若二阶常系数线性齐次微分方程，则非齐次方程满足条件的解为y=____.

线性非齐次方程的两解之差是其对应齐次方程的解。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。