datum level cycle structure 基准面旋回结构
The paper introduced the technical parameters, basic structure and work cycle of each subsystem of air compressor with the aim to improve the operation level of workers.
文中介绍了空压机的有关技术参数和基本结构、各子系统工作循环，以便提高工作人员对空压机的操作水平。
A math model of the sub structure level is built to calculate the work cycle.
为设计计算工作循环，建立了该模型结构子层的数学模型。
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