Harry Langer 的 KDP 数据
Harry Langer 在 Amazon 有 31 本书，近 30 天有 30 本上过榜，最好排名 #6，主要在Electrical & Electronics、Electronics、Transistors。
31Amazon 上的书
30近 30 天上榜书
3.9平均评分
| 价格中位数 | $6.99 |
|---|---|
| 价格区间（中间 50%） | $4.99 – $12.99 |
| 评论中位数 | 3 |
| 评论总数 | 23 |
| 近 30 天新书 | 19 |
| 近 30 天突围新书 | 11 |
数据解读
- 近 30 天 97% 的书上过榜，整个书目都在卖，不靠单本。
- 定价中位 $6.99，比主类目「Electrical & Electronics」的中位价低 71%。
- 近 30 天新上 19 本，其中 11 本冲进了畅销榜。
Harry Langer 排名最好的书
-
Celestial Mechanics - 300 Problems and Solutions: In Gravitational Dynamics and Orbital Motion (numerical problems in physics)
作者 Harry Langer
- 价格$6.99
- 评论-
-
Challenging Problems in Physics - Electronics Part 2 - 300 Numerical Problems: In Electronic Circuits, Amplifiers and Digital Electronics (numerical problems in physics)
作者 Harry Langer
- 价格$5.99
- 评论-
-
300 Numerical Problems in Physics - Electronics Part 1 - Semiconductor Physics and Electronic Devices: A Complete Worked Problem Course from Ohm's Law to Thermal Design
作者 Harry Langer
- 价格$6.99
- 评论-
-
300 Numerical Problems in Physics - Electronics Part 1 - Semiconductor Physics and Electronic Devices: A Complete Worked Problem Course from Ohm's Law to Thermal Design
作者 Harry Langer
- 价格$15.99
- 评论-
-
Elaborate Quiz Book on Mechanical Engineering - 1100 Q&A: A powerful tool for self study and revision (Engineering Books 1)
作者 Harry Langer
- 价格$4.99
- 评分4.4
- 评论3
- 出版2025-11
-
Physics of Fluid Mechanics - 300 Solved Problems in Statics, Dynamics, and Flow Analysis: A Problems & Solutions Guide for Physics and Engineering Students (numerical problems in physics)
作者 Harry Langer
- 价格$6.99
- 评论-
-
Challenging Problems in Physics - Electronics Part 2 - 300 Numerical Problems: In Electronic Circuits, Amplifiers and Digital Electronics (numerical problems in physics)
作者 Harry Langer
- 价格$13.99
- 评论-
-
Quiz Book on Metals & Metallurgy: A Learning Companion for Students and Science Enthusiasts (Engineering Books 4)
作者 Harry Langer
- 价格$4.99
- 评分5.0
- 评论4
-
Advanced Thermodynamics Problems - 300 Challenging Numerical Questions with Detailed Solutions (numerical problems in physics)
作者 Harry Langer
- 价格$5.99
- 评论-
-
Powerful Quiz Book on Electrical Engineering - 1000 Q&A: Essential Knowledge for Students and Professionals (Engineering Books 7)
作者 Harry Langer
- 价格$4.99
- 评分4.0
- 评论1
主要上榜类目
数据说明
数据来自 KDPTop 每天对 Amazon 公开榜单页面的抓取，中位数基于最新一期畅销榜。机会分综合了评论门槛、低评论书占比、榜单更替、新书占比和价格，0–100 分，越高越容易进入。