注意：此部分試題請(qǐng)?jiān)诖痤}卡2上作答。
47. The warnings from electronic road signsare not working as well as expected because people usually ________.
45. The in-car computer system, whichNikolaos Georgis has filed for a US patent, provides a nationwide database of ________.
49. The speculatior raised by Pertti Peussais based on a function of the in-car computer that prevents the car exceedingcertain speeds when ________.
50. Laser is not regarded as the bestoption of detecting surface conditions for it always fails to detect ice under thecondition of ________.
51. What could be the obstacle to theultimate aim of designing friction sensors?