4 * 4 keyboard scan button, based on key values, an LED display the corresponding key
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The message model, which defines the contract between the process and its supporting services, is therefore minimal, based only on a small number of key values.
因此，消息模型(它们定义流程与其支持服务之间的合约)占用的数据非常少，只使用了少量关键值。
How to set primary key with duplicate values based on main primary key?
如何基于主密钥重复值，主键设置？
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