[名词解释] 共振吸收

食管癌等中心定位多采用() ["A．前后对穿野","B．两侧对穿野","C．一前两后野","D．两前一后野","E．前后对穿野加右前左后野"] 差频与差拍 何谓功能性胃肠病及其主要表现? 调制 食管癌一前两后野定位，机架应为() ["A．-10°、-140°、+120°","B．0°、-130°、+130°","C．10°、-120°、+140°","D．0°、-120°、+120°","E．10°、-130°、+130°"] 共振吸收