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。

简述学与教的三种过程模式。

当前矿产勘查的主要技术手段及其应用前提。/简述找矿技术方法的一般分类及其方法原理和作用。

矿化与围岩蚀变分带：

围岩蚀变分带：

简述斑岩铜矿的蚀变分带规律。

简述斑岩型铜、钼矿床的蚀变分带模式？

具有特征的蚀变矿物组合

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。