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【单选题】
It can be inferred from the passage that in the early 1800's children were generally regarded by their families as individuals who______.A.
needed enormous amounts of security and affection
B.
required constant supervision while working
C.
were important to the economic well-being of a family
D.
were financial burdens assumed for the good of society
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举一反三
【单选题】断路的跳合闸位置监视灯串联一个电阻目的是( )。
A.
限制通过跳闸线圈的电流
B.
补偿灯泡的额定电压
C.
防止因灯座短路造成断路器误跳闸
D.
防止因灯座断路造成断路器误跳闸