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【单选题】
锅炉转杯式喷油器所带风机的供______作用。 1雾化燃油;2防止油高温缺氧产生炭黑;3供应燃烧所需大部分空气。A.
①
B.
①②
C.
②③
D.
①②③
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举一反三
【单选题】From then on, a sound system of Party Committee meetings was ______ in all leading bodies.
A.
constructed
B.
instituted
C.
confirmed
D.
given up
【单选题】______ is the branch of linguistics which studies the sound patterns of languages from a function perspective.
A.
Phonetics
B.
Semantics
C.
Phonology
D.
Sociolinguistics
【单选题】Sound waves reflected from a hill can be used to estimate the ________.
A.
height of the hill
B.
speed of sound
C.
distance to the hill
D.
intensity of sound
【单选题】Under proper conditions, sound waves will be reflected from a hillside or other such obstruction. Sound travels at the rate of about one-fifth of a mile per second. If the hill is eleven hundred feet ...
A.
height of the hill
B.
speed of sound
C.
distance to the hill
D.
intensity of sound
【单选题】Under proper conditions, sound waves will be reflected from the hillside or other such obstruction.
A.
mirrored
B.
bounced back
C.
absorbed
D.
soaked through
【单选题】Sound moves from its source to the ear by wave like fluctuations in air pressure, something like the peaks and troughs or the lowest point of ocean waves. One way to keep from hearing sound is to use ...
A.
the rising and falling of water in the ocean
B.
the crests and valleys of mountain ranges
C.
a flag waving in the air
D.
a machine for measuring air pressure
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