About关于
What This Site Is, and Is Not
这个站点是什么，不是什么
Sources, method, how the lab grades an answer, and the limits we keep to.
资料来源、做法、互动练习怎样判分，以及我们守住的边界。
What is here这里有什么
A study site for the AAPT Physics Bowl on tian-2.com: an overview of the contest, an answers-only question bank of 743 past questions from 15 papers, an interactive lab in which 15 recent questions are worked in full, and a reading list of our three solution books and notebook articles.
tian-2.com 上面向 AAPT Physics Bowl 的学习站点：赛制介绍、收录 15 套试卷 743 道真题且只给答案的题库、15 道近年真题完整讲解的互动练习，以及三本题解书和手记的阅读清单。
Sources来源
- The official papers. Contest facts (format, divisions, scoring, tie-break, team score, regions, conventions, contest windows) are read from the cover instructions of the 2013, 2024 and 2025 papers, downloaded from AAPT and archived with checksums, and from the AAPT Physics Bowl pages captured in May 2026. Dates change every year; the official site is the authority.官方试卷。赛事信息（形式、组别、计分、同分规则、团体分、赛区、考场约定、比赛时间）取自 2013、2024、2025 年试卷的封面说明（从 AAPT 下载并带校验值存档），以及 2026 年 5 月抓取的 AAPT Physics Bowl 页面。日期每年都会变，一切以官网为准。
- Our solution books. The question bank is built from the LaTeX sources of our three Physics Bowl books, whose question text and answer keys are identical across the three editions after a full review of every question.我们的题解书。题库由三本 Physics Bowl 题解书的 LaTeX 源文件整理而来；经过逐题复核，三个版本的题目文字与答案完全一致。
- The archived answer keys. For 2013, 2024 and 2025 every key in the bank was compared with AAPT’s published key; all agree.已存档的官方答案。2013、2024、2025 三年，题库中的每个答案都与 AAPT 公布的答案逐一比对，全部一致。
Method做法
The bank shows each question with its options, figures, year, question number, division and topic, and the letter of the correct answer. It never shows the worked solutions: those are the content of the books. Division tags follow the rule printed on the papers (Division 1 answers Q1–40, Division 2 answers Q11–50). Where our source had a problem (a mislabelled question, a missing shared stem, a key the printed data do not reproduce) the card says so.
题库为每道题给出题目、选项、配图、年份、题号、组别与专题，以及正确选项的字母，但从不给出完整解答：那是题解书的内容。组别标签按试卷上印的规则标注（Division 1 作答第 1–40 题，Division 2 作答第 11–50 题）。源文件有问题的地方（题号标错、缺少共用题干、按印刷数据算不出所给答案），卡片上都会注明。
The 15 lab questions are the free full-solution sample. Each was solved again independently in python3 from the question text alone, and the result was compared with our books and with AAPT’s key; all agree.
互动练习中的 15 道题是免费开放完整解答的样章。每道题都只根据题目文字用 python3 独立重算，并与题解书和 AAPT 官方答案比对，全部一致。
How the lab grades an answer互动练习怎样判分
Each question is multiple choice, as on the day: pick a letter and check it. A wrong letter is marked with a cross. Marks are given in proportion to the parts you get right; each hint you open takes a quarter off (never below a quarter), and opening the full solution first means the attempt is not scored.
每道题都和考场一样是选择题：选一个字母再提交。选错会打叉。按答对的小问比例给分；每看一条提示扣四分之一（最低保留四分之一），先看完整解答再作答则不计分。
What this site is not这个站点不是什么
- Not official. This is an independent study site. It is not affiliated with or endorsed by the American Association of Physics Teachers.不是官方。这是独立的学习站点，与美国物理教师协会无隶属关系，亦未获其认可。
- Not a threshold. No page states the score needed for any award or placing.不给分数线。任何页面都不写获奖或名次所需的分数。
- Not a record of you. Lab progress and your language choice are stored only in your browser’s local storage. The lab shares its language setting with the other lab pages on tian-2.com. Nothing is sent anywhere.不记录你。练习进度与语言选择只存在你浏览器的本地存储里，互动练习的语言设置与 tian-2.com 上其他互动练习共用，不会上传到任何地方。
Copyright版权
Physics Bowl questions and their figures are © the American Association of Physics Teachers and appear here for study. The analyses, answer checks, visualisations and solutions are original work. The papers themselves, with AAPT’s own solutions, are free at aapt.org.
Physics Bowl 真题及其配图版权归美国物理教师协会（AAPT）所有，在此用于学习。题目分析、答案核对、可视化与解答均为本站原创。试卷原文及 AAPT 自己的解答可在 aapt.org 免费获取。