a
美[eɪ] 网络一个；一种；一；一位
1 . Liver and kidney are particularly rich in vitamin A .
肝脏和肾脏富含维生素A。
来自柯林斯例句
2 . Details are available from the Hon. Sec. A .R. Bushby.
详情可咨询名誉秘书A.R.布什比。
来自柯林斯例句
3 . I was assigned to Troop A of the 10th Cavalry.
我被派往第10骑兵队的A连。
来自柯林斯例句
4 . Passes are graded from "A " down to "E".
及格分为A到E几等。
来自柯林斯例句
5 . Use only clean, Grade A, perfect eggs.
只用表面干净、无磕碰的A级鸡蛋。
来自柯林斯例句
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
a，拉丁文、英文等语言中字母的第一个，在英文中也是一个不定冠词。这个字母在很多领域均有应用，代表的含义各不相同，比如物理中表示电流单位，遗传学中表示腺嘌呤，游戏中表示攻击，网络语言中表示诈骗等等。