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英国物理研究所(NPL)的主要任务是保存和发展计量基准、标准。目前计量的发展趋势表现为:经典的实物基准日益被原子或量子基准所代替。近十年来,长度和时间单位已采用原子基准。很可能将来在其它方
The main task of the British Institute of Physics (NPL) is to preserve and develop measurement bases and standards. The current measurement of the development trend as follows: the classic physical benchmark is increasingly replaced by atomic or quantum benchmarks. For the past decade, the length and time units have been atomically referenced. Probably on the other side in the future