给家兔(体重2.5kg)静脉注射20%的葡萄糖溶液5mL后,尿量有何变化?为什么?
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What does the author say boredom can lead to?
A. Determination.
B. Mental deterioration.
Concentration.
D. Harmful conduct.
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.
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
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