【计】 交换网络服务

guanine nucleotide exchange factor (GEF)

countercurrent exchange

dollar exchange

effective cation exchange capacity\nECEC\n土壤

favo(u)rable balance of foreign exchange earnings and outlays【贸易】

in exchange with

displacer insert in heat-exchange conduit

ion-exchange electrokinetic chromatography，IEEKC