目前血液系统的建模主要建立了动脉系统的数学模型、静脉系统的数学模型和（）的数学模型等三种模型。

系统分析先确定现行系统的逻辑模型再建立现行系统的物理模型。

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

确定等价系统的过程，也是建立模型的过程，正确的步骤为（）。
①参数估计
②模型结构的确定
③试验设计
④模型验证

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。