Answer: B
This question tests scientific and technological knowledge.
Item A is wrong. VR glasses are VR headsets. VR headsets use head-mounted display devices to close people's vision and hearing to the outside world, guiding users to have a sense of being in a virtual environment. Feel. Its working principle is to interactively display left and right eye images on the screen. Use stereoscopic glasses with this type of stereoscopic display mode, and only need to use the vertical synchronization signal as the shutter switching synchronization signal to achieve the purpose of stereoscopic display. When using other stereoscopic display devices, the left and right eye images (pictures separated by vertical sync signals) can be distributed to the left and right eye display devices.
Item B is wrong. Currently, there are two common methods for smart bracelets to monitor heart rate. One is the photoelectric transmission measurement method. The so-called photoelectric transmission measurement method, simply put, is the regular beating of the heart. Causes changes in blood transmittance, collects this change information and converts it into electrical signals, which corresponds to heart rate information; the other is the ECG signal measurement method. The so-called ECG signal measurement method is to detect the periodic changes in the ECG. You can detect your heart rate.
Option C is correct. Graphene is a two-dimensional carbon nanomaterial with excellent optical, electrical, and mechanical properties. It has strong thermal radiation and is widely used in aerospace, sensors, and smart heating clothes. etc., especially in the Winter Olympics, which have been widely used, such as the clothes, scarves, socks and other graphene textile flexible heating materials worn by Winter Olympics-related personnel. While graphene textile flexible heating materials have excellent thermal conductivity, It also has the advantages of ordinary fabrics such as washability, softness, lightness, comfort and durability. It can be washed, kneaded and cut repeatedly without affecting its efficacy.
Item D is wrong. The wearable thermometer is equipped with a smart temperature measurement chip, which uses a temperature probe to detect the temperature of the human body, rather than using infrared detection. When used, it can work by fixing it on the armpit and other parts with a band-aid, etc., and its measurement accuracy can be achieved. Users only need to install the "Anxin Measurement" APP on their mobile phones and bind it to the device, and then they can see accurate body temperature data on their mobile phones.
So the correct answer is C.