信源编码的目的是提高通信的（），信道编码的目的是提高通信的（），加密编码的目的是保证通信的（）。

扰码的作用主要有两个，一是（）；二是（）。

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

UE是通过哪个信道来识别小区扰码的（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

在语音通信交换系统中有IA码的概念，IA的全称是（）。

码规划主要是根据扰码和下行导频码的规划，采取先导频码后扰码的规划原则，同一个基站不同扇区间使用不同基扰码组。