逻辑代数中的三种基本运算为(1)、(2)、(3)三种。
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数字电路中能实现三种基本逻辑关系的基本单元电路是(1)、(2) 、(3)。
Which one is not an example of internal risk?
A. injuries to employees within a factory
B. a fire in a warehouse
C. an earthquake
The other way of looking at risk is to divide up risk into categories.
A. Four
B. Five
C. Three