[简答题]根据《配电安规》，电缆耐压试验前，应先对被试电缆充分放电。加压前应在被试电缆周围设置遮栏（围栏）并悬挂警告标示牌，防止人员误入试验场所。

{{B}}What Do Dreams Tell Us {{/B}}
1 Why do we dream Do dreams have meanings These are questions which have troubled man for thousands of years. The oldest surviving book on the interpretation of dreams is Egyptian and is nearly 4,000 years old. In ancient Greece, it was thought that people who were iii could be cured by telling their dreams. They would relate their dreams to their doctors who would tell them what they meant, and then give them medicine to make them well. The ancient Chinese believed that if a pregnant woman dreamed of a bear, she would have a son, and if she dreamed of a snake, she would have a daughter. There are many stories about dreams foretelling (预言) the future.
2 We certainly do not now believe that dreams foretell the future. Most scientists believe that dreams are based on events i