The oligomer structure in polycarbonate(PC)was studied by combination of GC-MS and FD-MS in the ethanol extract of PC.

用气相色谱质谱和场解吸质谱方法研究聚碳酸酯的乙醇萃取物。

youdao

Mass spectra (MS) of cholesterol esters and halides were obtained by means of Electron Impact (EI), Field Desorption (FD) and Chemical Ionization (CI).

研究了胆甾醇酯类和胆甾醇卤代物的电子轰击电离（EI）、场解吸电离（FD）、化学电离（CI）的质谱。

youdao