非球面车削
turning of asph eric surface
凸面车削附件
convex turning attachment
椭球面车削
turning the surface of an ellipsoid
n通道硅平面外延JFET
n-channel silicon planar epitaxial JFET
半自动高速端面外圆磨床
semi-automatic high-speed angular plunge cylindrical grinder
车外加速噪声
accelerating noise outside
Noise emitted by accelerating motor vehicle
Vehicle passing-by noise
车外气动噪声
vehicle exterior aerodynamic noise