在构件发生断裂破坏前，有明显先兆的情况是____的典型特征。

结构或构件在破坏前无明显变形或其它预兆的破坏类型称为脆性破坏。

钢结构发生脆性断裂破坏的影响因素有哪些？

韧性断裂的特征是断裂前发生明显的（），如低碳钢拉伸试样的杯状断口。

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.

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。

以下哪些情况会造成提示“Incorrect number or IP address”？（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。