题目内容

某电视机水平一垂直扫描发生器需要一个分频器将31500Hz的脉冲转换为60Hz的脉冲,预构成此分频器至少需要()触发器。

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利用反馈归零法获得N进制计数器时,若为异步置零方式,则状态Sn只是短暂的过渡状态,不能稳定,会立刻变为状态So。

A. 对
B. 错

16.What does the speaker talk about first in his speech?The speaker first gives _________________ about his company.

17.What are the main products of the company?Clothing, ____________________________ and household products.

18.How long has the company been in business?Over ________________________________________.

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