variable sign变量符号variableadj.可变的；易变的n.变量；易变的东西variable coefficient combined kdv-Burgers equation变系数组合kdv-Burgers方程variable-coeffficient partial differentialequation变系数偏微分方程Variable Displacement Pump-Fixed Displacement Motor变量泵一定量马达Variable refrigerant volume air-conditioning system变制冷剂流量多联分体式空调系统variable cross-section continuous concrete box-beam变截面连续箱梁桥variable-refrigerant-volume air conditioning system变频多联空凋variable-capaoitance micromechanical acceleration sensor电容式微加速度传感器variable-frequency regulating speed experimental platform变频调速实验平台variable-speed constant-frequency wind energy generation变速恒频风力发电variable-speed constant-frequency-and-voltage generating system变速恒频恒压发电系统