In contrast, AIX is broken down into four main operating system levels: version, release, technology level (TL), and service pack (SP).

相比之下，AIX分为四个主要的操作系统级别：版本、发行版、技术级(TL)和服务包(SP)。

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This paper introduces the application of The 'SP' synthesization foam spray fire extinguishing device for a main transformer in the substation.

介绍了“SP”合成型泡沫喷淋灭火装置及其在变电所主变压器消防中的应用。

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The results showed that Dichomeris sp. was the main cone pest, but the damage of Sinorsillus piliferus and Gleosporium sp. and Lophodermium sp. can set up discoloration of cones.

结果表明球果害虫主要是杉木球果麦蛾，而杉木扁长蝽等的危害及炭疽菌、散斑壳菌的侵染可导致球果变色。

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