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【简答题】
图所示电路中N为含源线性电阻网络。当S断开时，U ab =12V；当S合上时，U ab =14V。求N的戴维南等效电路。
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【单选题】You have to be a born _______ to be able to do this hard job and not despair.
A.
optimistic
B.
optimist
C.
optional
D.
option
【单选题】You have to be a born ________ to do this hard job and not despair.
A.
optimist
B.
artist
C.
dentist
D.
journalist
【简答题】显示器的分辨率用整个屏幕上光栅的_______和_______的乘积来表示。
【简答题】You have to be a born __________ to be able to do this hard job and not despair.
【单选题】'The city grew outward instead of upward' (Line 1, Para. 2) means ______.
A.
the city became more spread out instead of growing taller
B.
there were fewer small houses than tall buildings
C.
rapid development took place in the city center
D.
many tall buildings could be found in the city
【简答题】电流为负值表示该电阻上实际电流方向与参考方向(__)。
【简答题】You have to be a born __________ to be able to do this hard job and not despair.
【简答题】饮用茶叶主要是散茶。
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