[判断题]不使用列尾装置的列车，以吊起尾部车辆软管代替尾部标志时，尾部车辆软管的吊起和释放工作，有列检作业的列车由列检人员负责；无列检作业的列车由车务人员负责。
A.正确
B.错误

{{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