11. Place the prime numbers 5, 7, 11, 13, 17, 19 and 23 such that the rows
and diagonals add up to the same prime (Fig. 1).
Answers
Step-by-step explanation:
1.Ambient light sensor & Proximity sensor; 2.Front camera; 3.Receiver；4、Volume button; 5.Power button; 6.Rear camera; 7.Flash; 8.USB port；9.Speaker; 10.Pin port; 11.Card tray; 12.Fingerprint sensor; 13.Microphone；14.Headset port.
Introduction to keys and widgets
Light sensor: Automatically detect the intensity of the ambient light, and adjust the brightness of the screen with the ambient light.
Proximity sensor: When making phone calls, this sensor automatically detects the distance between you and your phone. If you're too close to your phone, it will switch off your screen to avoid unintentional triggering of certain functions. The sensor is inactive in headset and handsfree mode.
It is normal for the light at the top of the screen to flash briefly when dialing or calling. This indicates the screen's infrared is working.
Volume buttons: You can adjust the volume using the volume button.
Front camera/Rear camera: You can take photos and record videos.
Receiver: You can hear the caller through the receiver when on the phone.
Power button: Long press the Power button in power off mode to turn on the mobile phone. Long press the button in boot mode to turn off the phone or reboot the phone.
Note
When the phone can not be used normally, simultaneously long press [Power button] and [Volume button -] more than 10 seconds to force the device to restart .
Fingerprint sensor: The button has the fingerprint recognition function, which can be used to unlock the phone instead of the password.
Card tray: Install/Remove the cards.
Pin port: Insert the pin into the pin jack on the side body, and press it inwards to eject the card tray.
Microphone: Transfer sound when you make calls.