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【判断题】
在电视教材中,同时或交错进行的解说词与画面配合的形式的优点之一是:把形象化感官材料提高到抽象化的概念层次。
A.
正确
B.
错误
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【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div
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【单选题】The solutions of NH 4 Ac is
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【简答题】计算下列波形的幅度和频率 ( 经探头接入 ) : ( 1 ) V / div 位于 0.2 档, t / div 位于 2 μ s 档。 1 H = 2div , D = 3div 2 H = 5div , D = 2div . 3 H = 3div , D = 5div ( 2 ) V / div 位于 0.05 档, t / div 位于 50 μ s 档。 1 H = 5div , D = ...
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