VPN主要采用了4项技术来保证安全，它们分别是加密技术、密钥管理技术、身份认证技术和(28)。

VPN主要采用了4项技术用以保障安全。它们是加密技术、密钥管理技术、身份认证技术和(28)。

VPN主要采用了4项技术来保证安全。它们是加密技术密钥管理技术，身分认证技术和______。

VPN主要采用了4项技术来保证安全。它们是加密技术、密钥管理技术、身份认证技术和(28)。

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。

以移动通信技术为基础，移动互联网实现了爆发式发展。移动互联网把整个信息技术产业带入快速发展通道，但是产业迭代周期并没有大的变化。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。