The NBS of United States, PTB of West Germany and IMGC of Italy have been visited in recent years. All of them are important metrological research institution in the World.
近几年来，我们先后访问了美国NBS、西德ptb和意大利IMGC，他们都是国际上重要的计量学研究中心。
The NBS of United States, PTB of West Germany and IMGC of Italy have been visited in recent years. All of them are important metrological research institution in the World.
近几年来，我们先后访问了美国NBS、西德ptb和意大利IMGC，他们都是国际上重要的计量学研究中心。
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