Cyclone of a regenerating system in a catalytic cracking unit in the Changling Oil Refining Plantcan not be protected by using conventional linner of alumina because of its small size.

长岭炼油厂新型催化裂化装置再生系统旋风分离器尺寸小，不能采用常规氧化铝内衬保护。

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"There are about 150 carriers in the US, " says Jonathan Linner, chief executive of wireless marketing firm Enpocket.

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