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【简答题】
如图所示,N为含源线性电阻网络,当开关S打开时,Uab=3V,开关S合上时,Uab=2V,则等效电路中U=()V,R=()Ω。
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举一反三
【单选题】According to this passage, the most important factor in developing a sense of trust is ______.
A.
the type of techniques used by the mother
B.
the sensitivity of the child
C.
maternal love
D.
the combined effect of natural feeling and cultural attitudes
【单选题】'These countries' in Line , Para. 3, most probably refers to ______.
A.
the developing countries which used to be colonies
B.
the former British colonies which now are developing
C.
the colonized countries which become as strong as Britain
D.
the developing countries which are still colonized by Britain
【简答题】人体所需的各种营养素可分为（）。
【简答题】烹饪营养中的营养素可分为_______和_______两大类。
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