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2022年专八改错42道练习题 (9)

2021-12-19 07:17:00来源：网络

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　　We're all used thermomoeters to measure temperature but

　　sometimes we need to measure temperature in places you can't _1_

　　put a thermometer — for example, inside a rocket engine. One of the best methods for those really hard-to-get-to place _2_

　　is based on laser spectroscopy. Light from a laser pointing _3_

　　at the region of interest is absorbed by molecules and some of it are re-emitted back towards the source where it can be _4_

　　measured. The re-emitted light is shifted in frequency (changed in wavelength) by amounts that depend on the molecule and also the temperature and pressure of the surrounding gas _5_

　　because of collisions among the molecules. The single, sharp frequency from the laser is thus smeared out into a whole spectrum of frequency whose shape can be used to determine _6_

　　the temperature provided so that the molecular transitions _7_

　　and line shapes are known. Because it is the main component of the air, it is convenient to use nitrogen since its molecular _8_

　　properties are known from room temperature to temperature of about 1，200 degree Celsius from experimental measurements. _9_

　　Although this is a large range, it is a large range, it is far short of what it is needed for some applications. _10_

　　答案：

　　1. places + where

　　2. place-places

　　3. pointing- pointed

　　4. are-is

　　5 also + on

　　6. frequency-frequencies

　　7. provided so that去掉so

　　8. since-and

　　9. degree-degrees

　　10. what it is去掉it

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