专八改错题We've all used thermometers to measure temperaturebut s

专八改错题
We've all used thermometers to measure temperature
but sometimes we need to measure temperature in places you （1） __
can' t put a thermometer —— for example,inside a rocket engine.
One of the best methods for those really hard-to-get-to
place is based on laser spectroscopy.Light from a laser point- （2） __
ing at the region of interest is absorbed by molecules and some （3） __
of it are re-emitted back towards the source where it can be （4） __
measured.The re-emitted fight is shifted in frequency （changed
in wavelength） by amounts that depend on the molecule and
also the temperature and pressure of the surrounding gas be- （5） __
cause 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 and （7） __
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 far short of what it is needed （10） __
for,some applications.

We\'ve all used thermometers to measure temperature
but sometimes we need to measure temperature in places you （1） __places后加where
can\' t put a thermometer —— for example,inside a rocket engine.
One of the best methods for those really hard-to-get-to
place is based on laser spectroscopy.Light from a laser point（2） __place--places
-ing at the region of interest is absorbed by molecules and some（3） _ pointing--pointed
of it are
re-emitted back towards the source where it can be （4） _are--is_
measured.The re-emitted fight is shifted in frequency （changed
in wavelength） by amounts that depend on the molecule and
also the temperature and pressure of the surrounding gas be- （5） __also后加on
cause 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） _frequency--frequencies_
the temperature provided so that the molecular transitions and （7） __删so
line shapes are known.Because it is the main component of
the air,it is convenient to use nitrogen since its molecular （8） __since--and
properties are known from room temperature to temperature
of about 1,200 degree Celsius from experimental measurements.（9）degree--degrees
Although this is a large range,it is far short of what it is needed
for,some applications.（10） __删,