counting frequency meter 计数频率计
frequency counting 频率计数
counting type frequency meter 计数式频率计
counting pulse frequency 计数脉冲频率
frequency counting modulator 频率计数调制器
measuring frequency by counting 计数测频法
Data is summarized by counting the frequency of various types of responses.
通过对各类回答的频率进行计数来汇总数据。
The clock measures the passage of time in millionths of a second by counting the frequency of electromagnetic waves.
这种钟表通过电磁波的频率来计算时间，单位为百万分之一秒。
By counting the number of such X-rays while scanning the frequency of the laser pulse, the team could make a very precise measurement of the photon energy required to drive the 2s-2p transition.
通过统计所发出X光的数量，然后对照激光脉冲的频率，测量小组能得出一个非常精确的测量值，从2s能级到2p能级跃迁所需的量子能量。
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