NaturalFrequency

It is a professional application for calculating the natural frequency of rigid foundation piers. It can quickly help users calculate the natural frequency, you only need to input relevant information according to the page. Click the Calculate button to know the result. The use of professional bridge construction calculation formula greatly reduces the user's operation.
SUBSCRIPTION INFORMATION

1. Service name: Member's advanced function
2. Price: The member function price is 50 yuan/month, 198 yuan/year
3. If you purchase an account of an automatic subscription member, you will be deducted from your iTunes account 24 hours before the expiration of the monthly subscription period. After the deduction is successful, the subscription period will be extended.
4. If you need to cancel the subscription, please manually open the Apple phone "Settings" --> Enter "iTunes Store and App Store" --> Click "Apple ID", select "View Apple ID", enter the "Account Settings" page, click "Subscribe", just choose to cancel the subscription. If you do not close the subscription at least 24 hours before the end of the subscription period, it will be deemed that you have agreed to continue the authorization, and the subscription will be automatically renewed.

Automatic Subscription Service Agreement:
https://www.jianshu.com/p/606d129b9e62

User Agreement:
https://www.jianshu.com/p/4d954d488e88

User Privacy Agreement:
https://www.jianshu.com/p/1b5990f44371