文件系统层次结构标准 Filesystem Hierarchy Standard ; FHS
操作系统层 OS ; Operating System Layer ; the Dore OS layer ; Operational Systems Layer
核心操作系统层 Core OS ; the Core OS layer
企业信息系统层 Enterprise Information System tier
系统层 System Layer ; System level ; Core OS Layer
系统层次 system level ; system layer
第一、操作系统层 OS
文件系统层次标准 FHS ; Filesystem Hierarchy Standard
信息系统层 EIS Tier ; Enterprise Information System
系统层面 system level
此种升降机采用的是矩形截面导轨，能够把工程人员直接送到工作层，简化了工程额外的复杂系和机械统。
The elevator USES is the rectangular section rail, can make the engineering staff directly to the working layer, simplifies the project additional complex system and mechanical system.
运用分析化验、储层测试等多种资料，对羌塘盆地中上侏罗统碎屑岩储层的成岩演化特征进行了研究。
Characteristics of Diagenetic evolution of clastic reservoir in the upper and middle Jurassic in Qiangtang basin are studied using data from chemical examination and reservoir measurement.
兖州煤田的上侏罗统红层直接覆盖于二叠、石炭系煤系地层之上。
Upper Jurassic red bed cover directly on coal measure strata of Permian and Carboniferous system in Yanzhou coal field.
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