简述两段式干煤粉加压气化技术的优缺点。

简述布尔算符（OR）的作用。

易受频率偏差的影响是OFDM系统一大缺点。

以下采用OFDM调制技术的802.11协议是（）.

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

OFDM技术的基本原理是什么？

简述技能工资制的优点和缺点。

LTE中OFDM技术实现需要依赖到的关键技术有( )

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。