婴幼儿在紧急状态下需增加心输出量时,具体是怎样代偿的?
下面关于脊柱CT扫描技术的叙述错误的是() ["颈椎椎体扫描采用5mm层厚,5mm层间距","颈椎椎间盘扫描采用2mm层厚,2mm层间距","胸椎扫描采用5~8mm层厚,5~8mm层间距","腰椎椎间盘扫描采用5mm层厚,5mm层间距","腰椎及骶尾椎椎体扫描采用8mm层厚,8mm层间距"]
氨硝酸银使用于抗牙本质过敏时,在牙面涂() ["A.30秒","B.1分钟","C.15分钟","D.2分钟","E.10秒"]
牙髓塑化剂不易用于前牙的原因是() ["A.牙髓塑化剂抑菌作用低","B.牙髓塑化剂刺激作用强","C.塑化剂可以使牙质变色","D.不易于操作","E.前牙根管宽大"]
宫外孕病人麻醉诱导时慎用() ["r-OH","氯胺酮","氟烷","潘库溴铵","维库溴铵"]
为什么新生儿不易耐受缺O。