The supporting time of apple healthy feet is generally around 180 degrees 10 second. Leg support is the time when both feet touch the ground when walking. The first contact and load-bearing reaction period of the supporting foot is equivalent to the weight loss reaction of the side foot and the foot leaving the ground. The double support stage is the most stable period in the walking cycle, and the time of the double support stage is inversely proportional to the walking speed.
Introduction to iPhone
IPhone is a series of mobile phones with iOS operating system released by Apple.
As of September, 20021year, Apple has released 32 mobile phone products, the first generation: iPhone, the latest version: iPhone 13 mini, iPhone 13, iPhone 13 Pro,? iPhone 13 Pro Max； The mute button of iPhone series products is on the left side of the front of the device. Before iPhone 5, models use 30Pin interface, and after iPhone 5, products use Lightning interface. The Home button is configured for models before iPhone X; After iPhone X, the physical Home button was cancelled.
IPhone series models have been equipped with Apple silicon self-developed chips since iPhone 4. Touch ID first appeared on iPhone 5s? [48]; IPhone 6s and iPhone 6s Plus added 3D Touch touch control on the screen for the first time; Wireless charging first appeared on iPhone8 and iPhone 8 Plus models, and Qi(Chee) wireless charging standard was adopted.