【Daily Question】Chemical Analysis Version, 2021.7.14
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China’s legal units of measurement consist of two parts: ( ). 1 A. International System of Units and **selected other units of measurement ； B. International System of Units and *other commonly used units of measurement ； C. International System of Units and **unit system ； D. The International System of Units and other units of measurement used internationally ； A
The answer should be A. The Legal Unit of Measurement is mandatory. The legal units of measurement in our country are based on the International System of Units (SI), with a few units from other measurement systems also being used. The legal units of measurement in our country (hereinafter referred to as legal units) include: (1) the base units of the International System of Units; (2) the auxiliary units of the International System of Units; (3) the derived units in the International System of Units that have specific names; (4) **selected units that are not part of the International System of Units; (5) composite units formed from the above units; (6) decimal multiples and fractional units composed of prefixes and the above units. The definition and usage of legal units shall be stipulated separately by the **Bureau of Metrology.
Choose D. Explanation: The legal units of measurement in the People’s Republic of China mainly consist of the base units of the International System of Units (SI) and the supplementary units of the SI. There are also derived units in the International System of Units that have specific names, China’s legal measurement units that can be used alongside the International System of Units, composite units formed from these units, as well as decimal multiples and fractional units composed of prefixes and the aforementioned units.