df 4 东风
df 4 b 东风b
df 4 d 东风d
df 4 series 东风系列
df 4 diesel 东风型
df 4 locomotive df机车
柔软剂DF-4 Softener
df 4 df diesel 东风df
df 4 c locomotive 东风c型机车
df 4 steel-crests df钢顶
以上来源于: WordNet
According to some reports, this facility enables DF-4 and DF-5 missiles to be stored and mobilised through underground tunnels to increase their survivability.
依照一些报道，这些设施允许DF - 4和DF - 5导弹能够被储存并且机动穿越地下隧道增加他们的生存性。
It is simple in use and its computation amount is about no more than that of a 4 point FIR DF.
该方法计算简单，计算量仅相当于4点fir数字滤波器的计算量。
The information of the modification of the electric system and the brake equipment of DF 4 locomotive, and their operation, were provided.
文中介绍了机车电气系统和制动系统的改造以及操作应用情况。
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