体育锻炼对人体哪些系统有积极的影响？

体育锻炼可以提高人体心血管系统技能水平。

生理机能是指人体在新陈代谢作用下，各器官系统的工作能力，下列选项中对生理机能的叙述明显错误的是（）

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.

什么叫信息系统拓扑结构？信息系统拓扑结构有哪几种类型？

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

下列属于人体八大系统的是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。