Despite being just 60 nanometres across, each of his dots contains millions of atoms of gold.
2
介绍了具有频率测量、脉冲周期测量、脉冲宽度测量以及脉冲信号占空比测量等功能的数字频率计。
It introduces a digital cymometer which has the functions of frequency measuring, pulse cycle measuring, pulse width measuring and pulse signal ratio measuring.
3
在静载试验中对混凝土裂缝宽度的量测采用HJ系列混凝应变计，获得了较精确的试验结果。
On the static loading test, to obtain a more precise result, the HJ series of concrete sensor was used to measure concrete crack width.
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