简述变质岩常见的结构。

简述区域变质岩的构造特征？

简述变质岩的矿物成分特征。

简述变质岩中的红宝石矿床。

简述接触变质作用类型及其变质岩。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

自然科学是研究自然界的物质形态、结构、性质和（）的科学。

狭义科学专指自然科学，即研究自然界物质形态、结构、性质和运动规律的科学。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。