1, bat:

Bat is an animal under Chordata and Mammals, and it is the only mammal that can really fly. In addition to the characteristics of general mammals, there are a series of morphological characteristics that adapt to flight.

The smallest is a mixed bat, weighing only 1.9g and having a wingspan of 16cm. Some flying foxes can weigh more than 1.3kg and have a wingspan of1.7m. Bats have light bones, a high degree of skull healing, developed shoulder straps and a keel-shaped sternum.

2. Radar:

Radar, the transliteration of English radar, comes from the abbreviation of radio detection and ranging, which means "radio detection and ranging", that is, finding the target by radio and determining its spatial position.

Therefore, radar is also called "radio positioning". Radar is an electronic device that uses electromagnetic waves to detect targets. Radar emits electromagnetic waves to illuminate the target and receives its echoes, thus obtaining information such as the distance, distance change rate, azimuth and altitude from the target to the electromagnetic wave emission point.

Extended data:

Radar functions like eyes and ears. Of course, it is no longer a masterpiece of nature, and its information carrier is radio waves. ?

In fact, visible light and radio waves are essentially the same thing, both electromagnetic waves, and the propagation speed in vacuum is the speed of light C, the difference lies in their respective frequencies and wavelengths.

Its principle is that the transmitter of radar equipment emits electromagnetic wave energy to a certain direction in space through an antenna, and the object in this direction reflects the electromagnetic wave it encounters; The radar antenna receives the reflected wave and sends it to the receiving equipment for processing, thus extracting some information of the object.

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