以下连网络设备中，工作于网络层的设备是(  )。

宽带IP网络技术向光互联网方向发展，具体地说，宽带IP网络的宽带传输技术将主要采用IPoverDWDM。

多媒体通信的网络技术包括宽带网络技术以及接入技术。

多媒体通信的网络技术包括宽事网络技术以及接入网技术。

多媒体通信的网络技术包括宽带网络技术以及接入网技术。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。