本书主要内容是青少年进行的"探秘中国古代科技发明创造"，包括两大部分，一部分是青少年针对在科技馆、展览馆等场所寻找到的古代科技发明创造索做的科学笔记，大多以板报的形式出现。另一部分是在100多份科学笔记的基础上，青少年对17个项目进行的探究，如技术简介、模型研究、相关知识点的分析等，包括纺车、龙骨水车、指南针、造纸术、弩机等17个项目。
Availability can change throughout the month based on the library's budget. You can still place a hold on the title, and your hold will be automatically filled as soon as the title is available again.
The OverDrive Read format of this ebook has professional narration that plays while you read in your browser. Learn more here.
Your session has expired. Please sign in again so you can continue to borrow titles and access your Loans, Wish list, and Holds pages.
If you're still having trouble, follow these steps to sign in.
Add a library card to your account to borrow titles, place holds, and add titles to your wish list.
Have a card? Add it now to start borrowing from the collection.
The library card you previously added can't be used to complete this action. Please add your card again, or add a different card. If you receive an error message, please contact your library for help.