【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!
【简答题】一批货物出口到新加坡,海运方式交货,卖方已投保了中国人民保险公司海洋运输货物保险条款中的一切险,未投保特殊附加险。货物因码头工人持续罢工而无法卸货,遭到损失,该损失应由保险人负责赔偿。( )
【判断题】The breakdown voltage at negative polarity is slightly higher than that at positive polarity.( )
【简答题】请将该英文句子翻译成中文 Fig. 1-2 shows the voltage across an element (represented by a rectangular block) connected to points a and b. The plus (+) and minus (-) signs are used to define reference direction or v...
【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.
【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.