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secondary control
auto.ctrl.	辅助控制
el.	二次控制
oil	二次井控
tech.	大地测量二级控制; 辅助操纵; 二等控制

secondary control: 55 phrases in 14 subjects

Automobiles	5
Aviation	8
Computer networks	1
Earth sciences	1
Electronics	3
General	1
Hydroelectric power stations	2
Information technology	1
Mechanics	1
Metallurgy	11
Oil / petroleum	2
Space	6
Technology	12
Telecommunications	1