渗碳体是碳和铁的金属化合物，含碳量为（）。

莱氏体的含碳量为（）%。

莱氏体的平均含碳量为2、11％。

与表达式职称="教授" OR 职称="副教授"等价的SQL表达式为职称（）（"教授"，"副教授"）或职称（）"%教授"

金属材料的冲击韧性随着材料含碳量的增高而增高。

金属材料与热处理是一门研究金属材料的成分、组织、热处理与金属材料性能之间的关系和变化规律的学科。

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。

黑色金属的机械性能与含碳量有很大关系，含碳量越高塑性越好。（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。