| 单词 | A |
| 释义 | A 1. Elect. ampere; amperes. 2. Physics. angstrom. 3. answer. 4. Brit. arterial (used with a road number to designate a major highway): Take the A525 to Ruthin. Symbol. 1. the first in order or in a series. 2. (sometimes l.c.) (in some grading systems) a grade or mark, as in school or college, indicating the quality of a student's work as excellent or superior. 3. (sometimes l.c.) (in some school systems) a symbol designating the first semester of a school year. 4. Music. a. the sixth tone in the scale of C major or the first tone in the relative minor scale, A minor. b. a string, key, or pipe tuned to this tone. c. a written or printed note representing this tone. d. (in the fixed system of solmization) the sixth tone of the scale of C major, called la. e. the tonality having A as the tonic note. 5. Physiol. a major blood group, usually enabling a person whose blood is of this type to donate blood to persons of group A or AB and to receive blood from persons of O or A. Cf. ABO system. 6. (sometimes l.c.) the medieval Roman numeral for 50 or 500. Cf. Roman numerals. 7. Chem. (formerly) argon. 8. Chem. , Physics. See mass number. 9. Biochem. a. adenine. b. alanine. 10. Logic. See universal affirmative. 11. Brit. a designation for a motion picture recommended as suitable for adults. Cf. AA (def. 5), U (def. 5), X (def. 9). 12. a proportional shoe width size, narrower than B and wider than AA. 13. a proportional brassiere cup size, smaller than B and larger than AA. 14. a quality rating for a corporate or municipal bond, lower than AA and higher than BBB. |
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