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反馈回路
construct.	Armstrong circuit
corp.gov.	feedback loop
el.	feedback path
el.mach.	feed-back loop
oil	backfeed loop
β反馈回路
el.	beta feedback circuit
反馈回环路
auto.	feedback loop

反馈回路: 17 phrases in 4 subjects

Electronics	5
Reproductive biology	2
Space	4
Technology	6