双光束 dual beam

双光束显微分光光度计 double beam microspectrophotometer

双光束激光二极管 dual beam laser diode

双光束单模激光器 dual beam single mode laser

双光束光栅分光光度计 double-beam grating spectrophotometer

双光束分光光密度计 double-beam spectrodensitometer

双光束干涉仪 dual beam interferometer ; two-beam interferometer

双光束偏振器 double-beam polarizer

双线束光谱学 double beam spectroscopy