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【单选题】
(), the number of private cars will increase sharply in the coming couple of years.A.
Undoubtedly
B.
Doubtedly
C.
Undoubted
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【单选题】Someone who lacks staying power and perseverance is unlikely to __________ a good researcher. [ ]
A.
make
B.
turn
C.
get
D.
grow
【单选题】Vocabulary and Structure: With “classical” electronics, electrical currents and voltage are used to carry information, whereas with power electronics, they carry .
A.
energy
B.
electricity
C.
power
D.
signal
【简答题】In contrast to electronic systems concerned with transmission and processing of , in power electronics substantial amounts of are processed.
【简答题】Vocabulary and Structure: Power electronics startedwith thedevelopment of mercuryarc rectifier.Invented by Peter Cooper Hewitt in 1902, the mercury arc rectifier was used to convert alternating curren...
【单选题】Choose the correct words or phrases to complete the sentences. Solar power can also be used to power portable electronics, ____ direct sunlight is usually not a readily available source of energy for ...
A.
given
B.
but
C.
or
D.
lest
【判断题】An AC/DC converter (rectifier) is not the most typical power electronics device in many consumer electronic devices.
A.
正确
B.
错误
【单选题】Vocabulary and Structure: Power electronics is the application of for the control and conversion of electric power.
A.
semiconductor devices
B.
solid-state electronics
C.
rectifiers
D.
three-phase circuits
【简答题】The capabilities and economy ofpower electronics system are determined by the that are available.
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