从外部网络访问来看，电子商务服务器的安全最核心的部分是（）

电子商务与电子政务都必须依靠以网络为核心的信息技术来实现。

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。

（）是整个网络的核心。

整个服务过程都在网络上进行的电子化公共服务方式是（）。

维护网络运行环境的核心任务之一是服务器操作系统的管理。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。