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【简答题】
什么叫电气调速?指标是什么? 他励直流电动机的 调速有哪几种方法?
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【单选题】Becasuse of a long drought, the farmer was ______ about the prospect of a good yield.
A.
alarmed
B.
uncertain
C.
unlikely
D.
suspended
【单选题】If the Europeans thought a drought—a long period of dry weather—was something that happened only in Africa, they know better now. After four years of below-normal rainfall (in some cases only 10 perce...
A.
They know more about the causes of the drought.
B.
They have a better understanding of the drought in Africa.
C.
They have realized that the drought in Europe is the most serious one.
D.
They have realized that droughts hit not only Africa but also Europe.
【单选题】The long drought was followed by months of____.
A.
famine
B.
tame
C.
fancy
D.
fatigue
【简答题】编辑完文档,如果要退出 Word ,最简单的方法是( )击标题栏上的 Word 图标。
【简答题】已知n是自然数，而n 2 -19n+91的值是完全平方数，求n．
【单选题】But sometimes, no rain falls for a long, long time. Then there is a dry period, or drought .
A.
洪涝
B.
干旱
C.
枯萎
D.
丰收
【简答题】甲数是m，比乙数的3倍多n．表示乙数的式子是______．
【单选题】After a long drought, heavy rain is expected______most of the area for the rest of the week.
A.
on
B.
above
C.
between
D.
throughout
【简答题】编辑完文档,如果要退出word,最简单的方法是( )击标题栏上的word图标。
【单选题】The long absence of rain _______ leads to a serious drought in the southwest of China, which draws the concerns of the whole country.
A.
immediately
B.
accidentally
C.
gradually
D.
undoubtedly
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