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command signal
avia. 控制信号
hydroel.st. 给定指令信号
space 指令信号; 指挥信号
tech. 命令信号
command signal: 21 phrases in 10 subjects
Air defense2
Automobiles1
Aviation1
Electric machinery1
Electronics7
Hydroelectric power stations2
Space3
Sports1
Technology2
Telecommunications1