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【单选题】
整流电路是利用二极管的( )把交流电变为直流电的电路。A.
）单向导电性
B.
）电阻特性
C.
）光敏电阻
D.
）热敏电阻
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举一反三
【单选题】All I suggest is that we ________electric wires out of the reach of children.
A.
keep
B.
to keep
C.
kept
D.
be kept
【单选题】What is not mentioned as a proper way to keep the electric wires?
A.
They should be kept clean.
B.
They should be kept dry.
C.
They should be in sufficient length.
D.
They should not be overloaded.
【简答题】In an electric lamp there should not be any oxygen in which the wires may burn away.
【单选题】Electric Wires should have each feature of the following except ____.
A.
flame retardant
B.
moisture resistant
C.
oil resistant
D.
low conductivity
【简答题】In terms of conductivity, aluminum is a good material for electric wires.
【单选题】Electric wires in your house are ___________ with poor conductors like rubber or silk.
A.
segregated
B.
insulated
C.
isolated
D.
served
【单选题】The electric wires in a house____with some kind of insulation.
A.
are covered
B.
were covered
C.
is covered
D.
will been covered
【判断题】Electricity comes into our houses by flowing through electric wires and cables in the sky.
A.
正确
B.
错误
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