What is the findings of one team of psychologists in their experiment?
A. Volunteers prefer watching a boring movie to sitting along deliberating.
B. Many volunteers choose to hurt themselves rather than endure boredom.
C. Male volunteers are more immune to the effects of boredom than females.
D. Many volunteers are unable to resist boredom longer than fifteen minuets.
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Why does the author say boredom isn’t all bad?
A. It stimulates memorization.
B. It may promote creative thinking.
C. It allows time for relaxation.
D. It may facilitate independent learning.
在R=S=“0”时，高电平输入有效SR锁存器( )。
A. 置“0”
B. 置“1”
C. 状态不变
与非门构成的SR锁存器的输入S=1，R=1，当输入S变为0时，输出将会（）
A. 保持
B. 复位
C. 置位
D. 翻转
与非门构成的SR锁存器的输入S=0，R=0时，其输出状态为（）。
A. Q=0，Q’=1
B. Q=1，Q’=0
C. Q=1，Q’=1
D. Q=0，Q’=0
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