為您提供a英英釋意。" />

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a

英 [?; e?] 美[e]
  • n. 字母A；第一流的；學(xué)業(yè)成績(jī)達(dá)最高標(biāo)準(zhǔn)的評(píng)價(jià)符號(hào)
  • abbr. [物]安（ampere）

英英釋意

1. the blood group whose red cells carry the A antigen
2. a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
3. any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
4. one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
5. (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
6. the basic unit of electric current adopted under the Systeme International d'Unites;
"a typical household circuit carries 15 to 50 amps"
7. the 1st letter of the Roman alphabet