[多选题]变电站的设备区、开关室、主控室、休息室严禁存放( )物品
A. 易燃
B. 易爆
C. 有毒
D. 化学

{{B}} Why We Laugh{{/B}}
We start finding things laughable — or not laughable — early in life. An infant first smiles at approximately eight days of age. Many psychologists assume this is his first sign of simple pleasure— food, warmth and comfort. At six months or less, the infant laughs to express complex pleasures—such as the light of Mother’s smiling face.
Between the ages of six months and one year, the baby learns to laugh for essentially the same reasons he will laugh throughout his life, says Dr. Jacob Levine, associate professor of psychology at Yale University. Dr. Levine says that people laugh to express mastery over an anxiety. Picture what happens when a father throws his child into the air. The child will probably laugh—but not the first time. In spite of his enjoyment of "flying", he is too anxious to laugh. How does he know Daddy will catch him Once the child realizes he wi