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问答题

If the time of a code element period is seconds and 16 levels signal are transmitted, the transmission rate is______b/s.

答案： 40000
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单项选择题

As shown in the figure, in order to make the vertical displacement of structure (a) at point 1 twice that of structure (b) at point 2, it is necessary : （ ）

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问答题

Language is a means of (         ) communication
答案： (1)
verbal
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