【单选题】【消耗次数：1】
下列不属于导向性传输介质的是（）
①
双绞线
②
同轴电缆
③
光纤
④
红外线
参考答案：
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①
没有克服资本主义的基本矛盾
②
没有爆发社会革命
③
没有扩大工人的民主权利
④
没有彻底消灭私有制
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immune
②
superior
③
essential
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similar
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①
adapted
②
adapt
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regulate
④
coordinate
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①
action
②
strategy
③
solution
④
impact
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①
before long
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until recently
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long before
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in the past few years
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①
admission
②
admit
③
admitting
④
admitted
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①
essential
②
visible
③
ultimate
④
profound
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①
figure on
②
figure out
③
find out
④
find
【单选题】
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①
concerned
②
connected
③
related
④
united