Why is it difficult to refuse fried sparrow? "Refuse" shows the what kind of attitude?

12., this article refers to "people living in cities, it is difficult to see all kinds of birds'', the author of the city wizard put forward "every city should have every city favorite small animals" point of view ・ How do you think the city has lovely animals?

Four, read, complete 13 - 16 questions・

Life detector

The life detector is an instrument for detecting the signs of life, and it is a high-tech rescue equipment・At present, there are infrared life detector, audio life detector and radar life detector・

The infrared life detector is mainly used for earthquake, explosion and other causes of building collapse, personnel trapped and buried in the ground, the correct determination of trapped personnel accurate position. It can withstand the harsh conditions of the rescue scene, detect the victims body heat, the use of infrared detectors, optical imaging lens to infrared radiation can be converted into electrical signals, processed through the TV screen or monitor display infrared thermography, so as to help the rescue team quickly determine the location of trapped persons・

Third, after the Second World War, an American company developed and developed the first generation of infrared imaging device used in military field, called infrared vision system・ In the early 1960s, a Swedish company added the function of temperature measurement, called infrared thermal imager・ In mid 60s, Sweden developed the first set