Mechanical Principle

More than 10000 high-definition mechanical principle Animation videos are still being updated~ All videos support video sharing. You can also convert the video into GIF motion picture and then share it~ What are you waiting for? Download it quickly~ How to contact us: If you encounter any problems during use, you can submit problem feedback in the mechanical diagram app. We will not answer you for 24 hours. Thank you for choosing the mechanical diagram app! [automatic renewal rules]

1. Subscription to membership services will be paid directly through iTunes account.
2. 24 hours before the expiration of the subscription service, the system will automatically renew and deduct the corresponding fees according to the subscription type.
3. If you need to close the continuous annual package service, please operate in "account settings" at least 24 hours in advance. Please manually open the Apple phone's "Settings" - > enter the "iTunes Store and app store" - > click "Apple ID", select "view Apple ID", enter the "account settings" page, click "subscription", and select VIP members to cancel the subscription. If the subscription is not closed at least 24 hours before the end of the subscription period, the subscription will be renewed automatically.
4. After purchasing a subscription, if there is an unexpired free trial, it will become invalid. Privacy Policy: https://jxylfile.ysfcoco.com/VR6a23e4gPkGnKpNsxMUFNQ3ww3fADOL/ys.html Terms of use: https://jxylfile.ysfcoco.com/ngjsy4VF6WoBnqYo0okuomIpclHFbQJu/vip.html