搜索 - 科创网

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内容：这里使用"-1100V"和"-1250V"两组负高压，分别作为"辉度"控制和"聚焦"控制的分压电路的直流电源，其目的是为了减少"辉度"控制和"聚焦"控制相互之间对显示波形的影响，以提高示波器工作的稳定性

内容：这其中的罪魁祸首是不稳定的电压：在中午时段关闭了许多仪器，使局部电压增高，导致加热装置在达到设定温度后还有一段后延，结果才酿成了这样的结果。,在用旋转蒸发仪蒸除溶剂时，一定要等压力稳定，溶剂蒸出时，人才能离开。,除了要注意贴好样品的标签以外，还应保证好样品有一个安全、稳定的放置，如存放在圆底烧瓶中的液体样品，有时一不小心，则可能前功尽弃、欲哭无泪。,最开始，我拿起硫酸纸就开始称，也不管天平稳定没有，周围的情况怎么样，结果称量不准，只能返工，如果遇上超级贵的样品，且已经混进其他称量样品里，那损失就更大了。,然后你要确信万分之一的天平此时很稳定，此时最好把旁边的窗户关闭，然后请天平所在台面的同学离开台面，你自己也不要碰台面，称量前用你剪的称量纸测试一下天平的稳定性，记下纸的重量，然后拿掉纸，天平如果回零，那证明可以开始称了

内容：　　几乎所有的电子电路都需要稳定的直流电源，特别是在检定检修指示仪表时，除了要有合适的标准仪器外，还必须要有合适的直流电源及调节装置。

时段	个数
{{f.startingTime}}点 - {{f.endTime}}点	{{f.fileCount}}

约找到 5780 条结果，耗时 0.458 秒

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当前账号的附件下载数量限制如下：