未知题型
压阻式传感器的工作原理是基于_______效应。
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未知题型
听力原文： Expanded use of computer technology, development of stronger and lighter materials, and research on pollution control will produce better, 'smarter' automobiles./In the 1980s the notion that a car would' talk' to its driver was science fiction; by the 1990s it had become reality./Onboard navigation was one of the new automotive technologies in the 1990s./By using the satellite-aided global positioning system (GPS), a computer in the automobile can pinpoint the vehicle’s location within a few feet./The onboard navigation system uses an electronic compass, digitized maps, and a display screen showing where the vehicle is relative to the destination the driver wants to reach./After being told the destination, the computer locates it and directs the driver to it, offering alternative routes if needeD./Some cars now come equipped with GPS locator beacons, enabling a GPS system operator to locate the vehicle, map its location/and, if necessary, direct repair or emergency workers to the scenE./
(1)
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，有功功率为P，则以下叙述正确的是 （ ）。
