搜索 - 科创网

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内容：上面说过，如果用PLL或DDS来实现扫频，有个问题是稳定时间长，因此扫描速度难以做得很快，而且这时是间断接收，每次接收相位都不一样。,比如span=1GHz，如果RBW为1KHz，为了不漏掉信号，应该扫至少100万点，此时对于稳定时间500us的PLL电路，需要至少500秒才能扫完一屏，远大于中频滤波器的响应时间，而且数据处理量大。

内容：一个都是骗子的社会是不稳定的，因为大家都不干活，都想骗别人，但一个全是好人的社会一样是不稳定。,所以行骗是很容易的事情，结果是骗子得到更多的利益，从而驱动更多的人去变成骗子，直到整个社会很警惕，当骗子变的越来越困难，最后当骗子的收益和付出平衡，这个社会就不会有更多的人再去当骗子，最后好人的骗子形成一个比例，达到稳定状态,一个是母性的繁殖策略，是一个稳定性的投资，一个是父性的繁殖策略，是一个投机型的投资。

内容：完成该题需要解决如下问题：（1）2自由度云台（2）初速稳定的电磁炮（3）自动控制及人机界面可见该题考察了电气、电子、机械、自动化等领域知识的综合运用和工程实践能力，拔高的话还可以用机器学习啥的来指导瞄准,B、关于电磁炮该电磁炮的关键是初速要稳定，也就是说每次发射的弹丸，飞行速度最好差不多快，不然外弹道无法预测，就很难打准。,这就提示该炮的充电电路必须限压或者稳压，比如采用200V电压给电容充电，充满时的电压最好能稳定到5%以内，不因等待时间不同而变化。

约找到 5783 条结果，耗时 0.292 秒

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注意事项：

当前账号的附件下载数量限制如下：