单词	超声波发生器
释义	超声波发生器ultrasonic generator
随便看	center-of-mass frame center-of-mass--frame center of mass; mass center center-of-mass [reference] frame center-of-mass space center-of-mass--space center of mass system center-of-mass system center-of-mass velocity center of mean distance center of moment center-of-momentum center of momentum frame｛=cm｝ center-of-momentum system center of motion center of origin center of oscillation center of oscillation of pendulum center of ossification center of pencil center of pendulum center of percussion center of perspective center of perspectivity center of planning area