短語詞組短語control valve variable 程控閥門變量control language variable 控制語言變量speed control with variable frequency 變頻調(diào)速coordinated control of variable frequency 變頻協(xié)調(diào)控制speed control by variable resistor 變阻器調(diào)速control with variable set -point 變定值控制 返回 control variable