dimensionless
(1)无量钢的
(2)无维的，无度的

• on-axis wave
• on-board optical system
• once-forbidden
• once-through
• once-way laser unit
• ondograph
• ondometer
• one-axis laser gyroscope
• one-dimensional
• one-dimensional aperture
• one-dimensional deflection
• one-dimensional Fourier transformation
• one-dimensional grating
• one-dimensional hologram
• one-dimensional manipulation
• one dimension detector arrays
• one-dimmensional array
• one-dimmensional laser
• one direction thrust bearing
• one-electron theory
• one flank gear rolling tester
• one-generator
• one-jpiece multifocal lens
• one-line scanning
• one pasa laser