| 释义 |
ffd 英'ef'efd'iː美'ef'efd'iː COCA⁵⁵⁷⁷¹
基本例句
=focal film distance 焦点胶片距离,=focus to film distance 焦点到胶片距离,=fox-fordyce disease 福克斯-福代斯二氏病:一种瘙痒性丘疹
The key point of depth migration is the wave field extrapolation operator. Several of them have been performed by computer program, they are PS, PSPI, SSF, FFD and GS.
深度偏移的核心是波场延拓算子的求取，我们编程实现了目前使用较多的几种算子：相移、相移插值、分步傅立叶、傅立叶有限差分以及广义屏算子。 fabiao |