【判断题】He did some research into Chinese history.
【简答题】样品的采集分____和____两种方法。采样的程序分为三步即____、____、____。
【简答题】从心理健康状态到心理疾病状态一般可分为四个等级:心理健康状态、 ( ) 、 ( ) 和心理疾病。
【判断题】There may be a surprising answer. Dr. Thomas Wehr did some research on sleep. During the winter, he put people in a room with no artificial light. Then he studied the people’s sleep patterns. 翻译: 答案可能...