back-scatteredBNC²³⁶²¹³⁺¹ 例句 First- order statistical properties of ultrasonic speckles back-scattered from an interface with tiny pits on, which is considered as one kind of weak scattering interface, are studied in this paper. 对超声入射至分布有细小凹坑的界平面,这一类弱散射界面背向散射所形成的超声散斑的一阶统计特性进行了研究。 cnki