业务状态机是事件驱动的业务事务，该业务事务定义了应用软件中给定部分的一组状态。
A business state machine is an event-driven business transaction that defines a set of states for a given part of the application.
用这个方式，很多数据可以作离机贮存，需要时，把磁碟组放入磁碟驱动器内。
In this manner, a great amount of data can be stored off-line and mounted on the disc drive when needed.
介绍了ULN2003的特点与电路结构，采用单片机连接uln2003组成的驱动系统来驱动步进电机。
The paper describes the characteristics and circuit of ULN2003, and designs the system of motor drive using the microcomputer combined with the ULN2003 to drive the stepper motor.
介绍了ULN2003的特点与电路结构，采用单片机连接uln2003组成的驱动系统来驱动步进电机。
The paper describes the characteristics and circuit of ULN2003, and designs the system of motor drive using the microcomputer combined with the ULN2003 to drive the stepper motor.
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