Because CCDs are essentially capacitive devices, they need external control signals and large clock swings to achieve acceptable charge transfer efficiencies.
因为ccd器件本质，他们需要电容外部控制信号，达到大钟波动可接受的电荷转移效率。
Frequency of external signals is constantly needed to be measured when complex measurement and control instructions are executed in an embedded system.
嵌入式控制系统在执行复杂测量与控制任务的同时，常需要测量外部信号的频率。
Frequency of external signals is constantly needed to be measured when complex measurement and control instructions are executed in an embedded system.
嵌入式控制系统在执行复杂测量与控制任务的同时，常需要测量外部信号的频率。
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