受激吸收的特点错误的是(). ["不是自发产生的","需要有外来光子的激发才会发生","不需要有外来光子的激发就会发生","外来光子的能量应等于原子激发前后两个能级间的能量差才会发生","受激吸收对激发光子的振动方向没有限制"]
关于整装法下列叙述不正确的是() ["模型支架,人工牙的唇颊面均包埋在下层型盒","人工牙易移位","卡环不易移位","适用于前牙唇侧基托的可摘局部义齿","咬合关系稳定"]
烧伤后超高代谢的主要原因是() ["高热","循环加快","创面大量水分渗出与蒸发","儿茶酚胺增高","胰岛素增加"]
下列哪项不是可摘局部义齿卡环移位的原因() ["包埋的石膏强度不够","开盒去蜡时包埋石膏折断","填塞塑料过早","堵塞塑料过晚","热处理后开盒过早"]
下列描述变量离期望值大小的指标是() ["A.变异系数","B.标准差","C.方差","D.期望值"]
步进电动机定子爪极性是()