1) steel DF
DF钢
2) d f/ d t
df/dt
1.
With the function of d f/ d t slip,it is mainly used in the relay protection test instrument as its digital amplitude and phase modulated voltatge source.
该滑差源具有df/dt频率滑差功能,主要用于继电保护频率滑差试验仪的核心部件数字调幅调相滑频电压源。
3) DF flush fluid
DF冲洗液
1.
It is introduced the status quo of domestic flush fluids, and is described a kind of DF flush fluid, which is developed according to the problems of poor compatibility between the cement slurry and the drilling fluid and the great i.
介绍了目前国内冲洗液现状,并针对水泥浆与钻井液相溶性差,对注水泥作业危害大等问题,研制开发了DF冲洗液。
4) DF system
DF系统
1.
Design and study on outside chip removing DF system of deep-hole drilling;
外排屑深孔钻削DF系统的设计与研究
2.
One kind of ulta-small-deep hole drilling and outside-chip removal system and methods of difficult-to -cut materials is introduced in this paper, the mechanism of chip removal ability of outside-chip removal DF system is analysised , and the principle of gun drill choosing, tool grinding .
本文介绍了一种难加工材料超细长外排屑深孔钻削系统和方法,分析了外排屑DF系统加强排屑的机理,阐述了枪钻的选取与刃磨、钻削用量和振动参数的选取原则。
5) DF project
DF方案
1.
Objective To evaluate the effect of late-course hyperfractionated accelerated radiation therapy (LCAHF) plus DF project chemotherapy on the treatment of the intermediate and advanced stage esophageal carcinoma.
目的探讨DF方案化疗合并后程加速超分割放疗治疗中、晚期食管癌的临床应用价值。
6) high-order digital filter
高阶DF
补充资料：DF
分子式：
CAS号：
性质：衡量空气过滤器过滤效果的一项指标。表示经过过滤器后尘粒浓度降低的程度。为穿透率（即经过滤器后仍然穿过的尘粒量与原始尘粒量之比值）的倒数。
CAS号：
性质：衡量空气过滤器过滤效果的一项指标。表示经过过滤器后尘粒浓度降低的程度。为穿透率（即经过滤器后仍然穿过的尘粒量与原始尘粒量之比值）的倒数。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条