改进型Monte Carlo射线追踪法
improved Monte Carlo ray tracing method
无杵体型射孔器
non-carrot forming type perforator
AC~I改进型配合比设计
AC-I improved mix proportion design
冯霍夫改进型目镜
Von Hofe modified eyepiece
改进M型电极法
improved M type electrode method
改进型125MW机组
improved-style 125MW unit