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【单选题】
在中国,“ 课程 ” 这个词,开始出现于( )。A.
夏代
B.
清末
C.
D.
手机使用
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举一反三
【简答题】The electric wires are p______ ( 保护 ) by a rubber covering.
【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】The electric wires in a house____with some kind of insulation.
A.
are covered
B.
were covered
C.
is covered
D.
will been covered
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