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a (an)

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
同义词： angstrom angstrom unit A
any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
同义词： vitamin A antiophthalmic factor axerophthol A
one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
同义词： deoxyadenosine monophosphate A
(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
同义词： adenine A
the basic unit of electric current adopted under the Systeme International d'Unites
同义词： ampere amp A
the 1st letter of the Roman alphabet
同义词： A letter a
the blood group whose red cells carry the A antigen
同义词： A type A group A

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

同义词：angstromangstrom unitA

any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

同义词：vitamin Aantiophthalmic factoraxerophtholA

one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

同义词：deoxyadenosine monophosphateA

(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

同义词：adenineA

the basic unit of electric current adopted under the Systeme International d'Unites

同义词：ampereampA

the 1st letter of the Roman alphabet

同义词：Aletter a

the blood group whose red cells carry the A antigen

同义词：Atype Agroup A

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