正电子发射断层扫描 A: proton emission tomography B: positron emission geography C: positron emission tomography
正电子发射断层扫描 A: proton emission tomography B: positron emission geography C: positron emission tomography
carbon emission
carbon emission
In this research at Columbia University, Charles Townes worked with ______. A: stimulated emission B: microwaves C: maser D: stimulated emission and microwaves
In this research at Columbia University, Charles Townes worked with ______. A: stimulated emission B: microwaves C: maser D: stimulated emission and microwaves
产生激光（光的受激辐射放大）的四个过程中，最重要的是 A: Pumping B: Spontaneous emission C: Stimulated emission D: Absorption
产生激光（光的受激辐射放大）的四个过程中，最重要的是 A: Pumping B: Spontaneous emission C: Stimulated emission D: Absorption
_______ further increasing quantum-well number, the increase of the emission energy becomes slow.
_______ further increasing quantum-well number, the increase of the emission energy becomes slow.
“污染”的英语单词是 A: Reduce B: Pollution C: Emission
“污染”的英语单词是 A: Reduce B: Pollution C: Emission
智慧职教: VHF DSC transmissions are encoded and transmitted in what emission mode?
智慧职教: VHF DSC transmissions are encoded and transmitted in what emission mode?
Electric vehicles will save a lot of air (pollute)______ because there will be emission of CO2 in the air.
Electric vehicles will save a lot of air (pollute)______ because there will be emission of CO2 in the air.
34. Electric vehicles will save a lot of air (pollute) ________ because there will be no emission of CO2 in the air.
34. Electric vehicles will save a lot of air (pollute) ________ because there will be no emission of CO2 in the air.
智慧职教: Electric vehicles will save a lot of air (pollute) _________ because there will be no emission of CO2 in the air.
智慧职教: Electric vehicles will save a lot of air (pollute) _________ because there will be no emission of CO2 in the air.