皮皮学，免费搜题
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【单选题】
主动运输的特点是（）
A.
可以从高浓度一边到达低浓度一边，不需要载体，消耗能量
B.
可以从高浓度一边到达低浓度一边，需要载体，不消耗能量
C.
可以从低浓度一边到达高浓度一边，需要载体，消耗能量
D.
可以从低浓度一边到达高浓度一边，不需要载体，消耗能量
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A.
正确
B.
错误
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【单选题】在以下几个性能指标中,RFC2544中没有涉及的网络设备性能测试指标是:
A.
背对背
B.
地址学习速率
C.
延迟
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吞吐量
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might
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may
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other
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others
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another
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the others
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【简答题】He is a careless boy.To ___(us)surprise,he brings everything we need forthe picnic.
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【简答题】教育的直接目的是什么？
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【简答题】完形填空 Someone once wrote, “All work and no play make Jack a dull boy.” Work is 1 but everyone needs leisure time too.Leisure time 2 free time to do whatever you want. 3 is a time for anything that 4 yo...
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【判断题】If the boy is a computer, each action is viewed as one instruction; if I group the series of instructions in sequence and give the computer the group to perform, I will not need to give the computer i...
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