Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the (66) preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract (67) , as a finite (68) .
Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a (69) of a sequential circuit whose internal state is not taken (70) .
It’s plain common sense—the more happiness you feel, the less unhappiness you experience. It’s plain common sense, but it’s not true. Recent research reveals that happiness and unhappiness are not really two sides of the same emotion. They are two distinct feelings that, coexisting, rise and fall independently.
People might think that the higher a person’s level of unhappiness, the lower their level of happiness and vice versa. But when researchers measure people’s average levels of happiness and unhappiness, they often find little relationship between the two.
The recognition that feelings of happiness and unhappiness can coexist much like love and hate in a close relationship may offer valuable clues on how to lead a happier life. It suggests, for example, that changing or avoiding things that make you miserable may well make you less miserable, but probably won’t make you any happier. That advice is backed up by an extr
A. One feels unhappy owing to his miserable origin.
B. They are independent but existing concurrently
C. One feels happy by participating in more activities.
D. They are actions and attitudes taken by human beings.
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