胎儿肺成熟度估价
estimation of fetal lung maturity
双波长比率法
dual-wavelength ratiometric
双波长比率
Dual wavelength ratiometry
dual wavelength ratiometric
双波长倍增示差法
Dual wavelength multiplication subtractive specpho
双边最小平方反滤波器
two-sided least-squares inverse filters
数组之整型波数合成法
shaped beam synthesis of array
数字正弦波发生器
Digital sine wave generator