短語詞組短語dispersive interdigital transducer 色散換能器slanted dispersive interdigital transducer 傾斜色散換能器surface wave interdigital transducer 表麪波叉指換能器interdigital transducer idt 叉指換能器saw interdigital transducer 表麪波叉指換能器 返回 interdigital transducer