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无源跟踪
 无源 跟踪
space passive tracking
 | 系统
 DPA系统
pest.contr. DPA System
 F系统
rem.sens. F system
 PELV系统
el.mach. PELV system
 SELV系统
el.mach. SELV system
 TN 系统
IT TN system
 TN-C 系统
IT TN-C system
 TN-C-S 系统
IT TN-C-S system
 TN-S 系统
IT TN-S system

to phrases
无源跟踪
avia. passive tracking
无源［被动］跟踪
space passive tracking
无源跟踪
: 20 phrases in 4 subjects
Air defense10
Aviation3
Electronics2
Space5

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