沟槽开挖深度达到2.0m时,须采取措施防止土层塌方。
心源性呼吸困难最早出现的临床表现是
A. 乏力、食欲减退、恶心、表情淡漠、嗜睡
B. 乏力、腹胀、心悸、心电图出现U波增高
C. 劳力性呼吸困难
D. 食欲不振、颈静脉怒张、肝大、双下肢凹陷性水肿
E. 暂时广泛脑组织缺血缺氧引起急性短暂可逆性意识丧失
You will hear a talk. As you listen, you must answer questions 21—30 by writing NO MORE THAN THREE words in the space provided on the right. You will hear the talk TWICE. In what sense was the central area important during the Classical Period
心理健康问题往往是导致疾病的原因2.分析人们产生心理健康问题的原因(可从失业、压力过重、缺少支持、缺乏人际关系等方面加以分析)3.你认为人们如何保持心理健康