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block control
auto.	联锁互锁控制器
busin.	成批控制; 分组管制
IT	块控制单元
mil.	连锁式控制机构
plann.	编号控制
tech.	闭塞控制
telecom.	块控制

block control: 290 phrases in 16 subjects

Automobiles	4
Aviation	5
Business	5
Computer networks	2
Computers	12
Drilling	1
Earth sciences	1
Economy	1
Electronics	128
Geophysics	2
Information technology	57
Navigation	1
Oil / petroleum	1
Space	5
Technology	51
Telecommunications	14