double beam mass spectrometer
... double base transistor ==> 双基极晶体管 double beam mass spectrometer ==> 双束质谱计 double beam spectrum radiator ==> 双光束光谱福射计 ...
beam mass spectrometer
... double acting positioner 双作用定位器 double-beam mass spectrometer 双束质谱计 double beam spectrum radiator 双光束光谱福射计 ...