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【单选题】
如下一段SAS程序: DATA TEST; DO I=1 TO 3; PUT I= ; END; RUN; 程序结果在LOG窗口输出形式为: ( )A.
I=1 I=2 I=3
B.
I=2 I=3 I=4
C.
不显示
D.
I=3 I=2 I=1
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举一反三
【单选题】Someone who lacks staying power and perseverance is unlikely to __________ a good researcher. [ ]
A.
make
B.
turn
C.
get
D.
grow
【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
【简答题】The capabilities and economy ofpower electronics system are determined by the that are available.
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