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primary controls
nautic., tech.	主控制器
primary control
busin.	主控
el.	一次控制
electric.	★ 一次调频
oil	首要控制
tech.	一等控制; 主要控制; 主干控制; 初期控制; 初步控制
UN, geol.	一等控制点

primary controls : 76 phrases in 14 subjects

Automobiles	3
Aviation	17
Computer networks	1
Earth sciences	1
Electricity	1
Electronics	13
General	1
Hydroelectric power stations	3
Information technology	3
Oil / petroleum	1
Skydiving	1
Space	2
Technology	25
Telecommunications	4