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公司创业主要指被已有组织发起的组织的创造、更新与创新活动，创业活动是由在组织中工作的个体或团队推动的。
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Digital circuits are electric circuits based on two discrete voltage levels labeled ‘Low’ ( 0 ) and ‘High’ ( 1 ) . Often ‘Low’ will be near zero volts and ‘High’ will be at a higher level depending on the supply voltage in use.
Computers, electronic clocks, and programmable logic controllers are constructed of digital circuits.
There are six basic logic gates: AND, OR, NOT, NAND , NOR, and XOR.
Take XOR as an example, the basic operations of XOR ( Exclusive-OR ) gate are described below with the aid of its truth table .
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