double-focus X-ray tube 双焦点X射线管
double crystal X-ray goniometer 双晶体X射线测角仪
double crystal X-ray spectrometer 双晶体X射线光谱计
double beam cathode ray tube 双电子束阴极射线管
double-crystal X-ray diffractometer 双晶X射线衍射仪
double x-ray exposures 二次x射线曝光
double-beam cathode-ray tube 双电子束阴极射线管 ; 双束电子束管
double beam cathode-ray tube [电子] 双束阴极射线管
double-order X-ray diffraction X射线双级衍射
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