表单包含了不同小部件的用户界面构建和通用业务逻辑。
A form template contains the user interface build and the common business logic of different widgets. The business logic must supply the following functions.
分析了MSI计数器74161的逻辑功能，它作为通用的时序部件可以实现任意同步时序电路。
The logic functions of MSI counter 74161 was analysed. It could be taken as a universal sequential module to realize any synchronous sequential circuits.
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