The International System of Units and other units of measurement adopted by the State shall be the national legal units of measurement.
国际单位制计量单位和国家选定的其他计量单位，为国家法定计量单位。
Taking the full network observability of power system operation state and least number of phasor measurement units (PMU) as objective function, an improved optimal PMU placement algorithm is proposed.
以电力系统状态完全可观测和相量测量装置（PMU）配置数目最小为目标，提出了一种改进的PMU最优配置方法。
An expanded and modified version of the metric system, the International system addresses the needs of modern science for additional and more accurate units of measurement.
公制的扩大和修改版本，即国际制度针对了现代科学附加的及更加正确的度量单位的需要。
An expanded and modified version of the metric system, the International system addresses the needs of modern science for additional and more accurate units of measurement.
公制的扩大和修改版本，即国际制度针对了现代科学附加的及更加正确的度量单位的需要。
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