Or is at least one of the two conditions is true, and the result is true.
And XOR is only one of the two conditions of the two conditions, that is, it is only established when there is one true and one false. Both are false as the true time. This is different from O.
EQV is that as long as two conditions are true or false, the result is true, and the result of one true and one fake is false.
IMP is more complicated, but just remember the two points:
1/two conditions have the order.
2/As long as the first condition is false, or the second condition is true, the result must be true.
IMP is the most difficult to remember
The first is the order of conditions
The second is that the conditions are not just True False, but also multiple NULL
The third is to compare according to the position
Condition one is false, or the condition is the true result of the true result of the true result is true
Only the conditions are true, and the condition II is fake.
The other is null
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