【单选题】女性,14岁,胸背痛1年,发病以来始终有低热,夜间盗汗,体重下降5kg。查体:脊椎轻度后凸畸形,胸部棘突压痛,X线片示胸椎溶骨性破坏,椎间盘受累,被诊为胸椎结核。术前嘱病人严格卧床的最主要是目的是
【单选题】女性,14岁,胸背痛1年,发病以来始终有低热,夜间盗汗,体重下降5kg。查体:脊椎轻度后凸畸形,胸部棘突压痛,X线片示胸椎溶骨性破坏,椎间盘受累,被诊为胸椎结核。若病人准备接受手术治疗,术前应用抗结核药物的时间至少应为
【简答题】Check the voltage at the black flat-contact socket in the vehicle and pay attention to the polarity to avoid incorrect polarity!
【单选题】马克思在阶级斗争方面的重要贡献不包括()。
A.
把资本主义社会分为生产者阶级、土地所有者阶级和非生产者阶级
B.
证明了阶级的存在仅仅同生产发展的一定历史阶段相联系
D.
提出专政是达到消灭一切阶级和进入无阶级社会的过渡
【单选题】女性,14岁,胸背痛1年,发病以来始终有低热,夜间盗汗,体重下降5kg。查体:脊椎轻度后凸畸形,胸部棘突压痛,X线片示胸椎溶骨性破坏,椎间盘受累,被诊为胸椎结核。术后护理措施中正确的是
【单选题】The plus and minus signs are used to define reference direction or voltage polarity. As the following Fig. shows, The polarity of point a and point b are ( ) and ( ), respectively.
【简答题】请将该英文句子翻译成中文 Current direction and voltage polarity play a major role in determining the sign of power.
【简答题】Why do current direction and voltage polarity play a major role in determining the characteristics of power?
【单选题】The voltage polarity and current i direction must conform with those shown in Fig.( ) in order for the power to have a positive sign.
【判断题】The negative polarity of the supply will reduce the potential barrier Vo by V because the applied voltage drops mostly across the depletion width W.