xx

n.

the cardinal number that is the sum of nineteen and one

同义词：twenty20

(genetics) normal complement of sex chromosomes in a female

Graph Minors. XX. Wagner's conjecture
Planck 2015 results. XX. Constraints on inflation
Era dos extremos: o breve século XX (1914-1991)
Studies on organophosphorus compounds XX. syntheses of thioketones
Trabalho e capital monopolista: a degradação do trabalho no século XX
ChemInform Abstract: STUDIES ON ORGANOPHOSPHORUS COMPOUNDS. XX. SYNTHESES OF THIOKETONES
International Union of Pharmacology. XX. Current Status of the Nomenclature for Nicotinic Acetylcholine Receptors and Their Subunits
Interaction of metal ions with polynucleotides and related compounds. XX. Control of the conformation of polyriboadenylic acid by di...
ChemInform Abstract: TOTAL SYNTHESIS OF OPTICALLY ACTIVE STEROIDS. XX. SYNTHESIS OF 7α‐METHYLESTRATRIENE BY STEREOSELECTIVE METHYL...
Numerical recipes: the art of scientific computing : Cambridge University Press, Cambridge, 1986 (ISBN 0-521-30811-9). xx + 818 pp...