反向替换方法
backward substitution method
二尖瓣替换
mitral valve replacements
mitral valve replacement
二级系数替换
secondary coefficients replacing
定总时有替换的试验
test with fixed total time and replacement
叠前层替换
prestack layer replacement
电化学替换组装
electrochemical substitution assembly
等量替换法
method of equal-weight replacement
等价无穷小替换
replacement of the equivalent infinitesimal quanti