A (EN)

字母，名词，符号

字母 “A”

1. 字母A
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   Alice began her alphabet lesson by writing an A on the whiteboard.

名词 “A”

1. 在学校中表现出色的最高成绩
   After studying all night, she earned As in all her subjects.

符号 “A”

1. A小调中的第一个音（也是调音的标准音高，振动频率为440赫兹）
   When tuning her violin, Maria always starts by adjusting the A string to match the 440 Hz pitch.
2. 带有特定抗原的血型
   If you have blood type A, you cannot donate blood to someone with type B because of the different antigens.
3. 原子核中质子和中子的总数
   In the nucleus of an atom, A represents the total number of protons and neutrons combined.
4. 一种比AA号电池略大的电池类型
   The flashlight requires A batteries, which are harder to find than the more common AA size.
5. 胸罩杯的最小标准尺寸
   She realized she had been wearing the wrong bra size and needed to switch to an A cup.
6. 几何中表示面积的符号
   To find the total space inside the square, we need to calculate its area using the formula A = side × side.
7. 摩托车驾驶执照的一种
   To ride that, you need to obtain an A category license.
8. 安培（测量电流的单位）
   The electrician measured the current of the circuit and found it to be exactly 10 A.
9. 在遗传学中，它是腺嘌呤的缩写。
   In the DNA sequence A T C G, "A" stands for adenine.
10. 在生物化学中，蛋白质中的丙氨酸的符号是
    In the protein sequence GAVLI, "A" stands for alanine.
11. 女低音，指的是声音范围低于女高音的音域。
    In the choir, she was assigned to sing the A part because of her rich alto voice.
12. 奥地利车辆识别标志
    On the back of the car, there was an "A" sticker indicating it was from Austria.