dual CPU双CPUdualadj.双重的；成双的n.双数dual-mode algorithm双模式算法dual-purpose nozzle多用水枪dual cohomology class对偶上同调类dual hybrid mode horn双混合方式喇叭dual-beam algorithm双束算法dual drum arrangement双鼓布局Dual optimation model对偶优化模型dual darlington array双达林顿阵列dual initiator system双引发剂体系dual mdulus preacaler双模预分频器