A.Laser scanner
B. Infrared sensor
C. Ordinary digital camera
D. Radio frequency tag
2. Affected by the Great East Japan Earthquake, the Fukushima Nuclear Power Plant was severely damaged and leaked a large amount of radioactive materials. Among them, the harm of iodine-131 has attracted much attention. Among the following statements about iodine-131, the incorrect one is ().
A. It has medical effects and can be used for thyroid function tests and thyroid disease treatment.
B. Strong radioactivity, iodine-131 carries strong energy rays, which can cause human DNA to break and produce a series of subsequent cellular reactions.
C. It exists for a long time, and the half-life of iodine-131 is as long as 8 years.
D. Spreads far, iodine-131 can attach to dust in the air and spread far away
3. Ultrasonic waves and infrasound waves are inaudible to us, but they are closely related to our lives. Which of the following statements about ultrasonic waves and infrasound waves is wrong ().
A. Ultrasonic welding utilizes the thermal effect of ultrasonic waves
B. Ultrasound imaging is a technology that uses ultrasound waves to present the internal image of opaque objects.
C. Infrasound waves can be used to predict natural disasters such as volcanic eruptions, tornadoes, and typhoons.
D. Human organs cannot produce infrasound waves, so humans cannot hear infrasound waves.
4. With the global popularity of mobile phones, mobile phones are becoming more and more perfect in appearance, feel and various additional function settings. Which of the following statements about the technological applications of mobile phones is correct ().
A. Mobile phones with NFC modules can support mobile payment or be used as bus cards
B. The fast charging of mobile phones is mainly due to the use of batteries with smaller capacities.
C. Currently, most smart bracelets use WiFi to connect to mobile phones.
D. The advantages of wireless charging for mobile phones are convenience, safety, durability and high efficiency.
5. Research on salt-alkali-tolerant seawater rice will help break through the constraints of my country’s limited arable land resources of 1800 million acres, and alleviate the three major crises of human water resources, arable land and food to a large extent. Which of the following statements about sea rice is incorrect ()?
A. The emergence of wild salt-alkali tolerant rice is the result of long-term natural selection
B. Salt tolerance and salt intolerance of rice are relative traits
C Through hybrid rice technology, the advantages of sea rice can be increased
D. The cell wall of sea rice can prevent the entry of molecules such as salt and alkali, so it can achieve the purpose of salt-alkali tolerance.
Reference answer
1.C
2.C
3.D
4.A
5.D
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