海底热液矿床是（）发现的一种海底矿产资源。

矿井开拓是矿山建设的重要组成部分，必须进行多方案技术经济比较，采用多种巷道对矿床进行开拓。以下矿床开拓方法正确的是（ ）。

矿井开拓是矿山建设的重要组成部分,必须进行多方案技术经济比较,采用多种巷道对矿床进行开拓,以下矿床开拓方法正确的是（     ）。

伟晶矿床的结构

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

矿床学中已学习了硫化矿床氧化带的知识

对矿石学研究能获得一些矿床成因方面的信息。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。