【 Weekly Topic】【 Quality Version 20161231】
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This post was last edited by yuchenchf on 2017-1-6 22:52. Reward for participation: 2 Wealth. Correct reward: 9 Wealth. Regarding the rules for the use of legal units and prefixes, which of the following statements is correct? ( ) A. The name and symbol of a unit can be used separately. B. When using prefixes to form units of multiples, overlapping prefixes shall not be used. C. For non-decimal units, prefixes shall not be used to form units of multiples. D. In composite units formed solely by multiplication, the prefix is usually added to the first element of the composite unit. BCD
Regarding the rules for the use of legal units and prefixes, the correct statements are (BCD). A. The name and symbol of a unit can be used separately. B. When using prefixes to form multiple units, overlapping prefixes shall not be used. C. For non-decimal units, prefixes shall not be used to form multiple units. D. In composite units formed solely by multiplication, the prefix is usually added to the first element of such units
BCD, but the last one is **incomplete; the correct form should be: composite units formed solely through multiplication, with prefixes usually placed before the first unit in such composite units.
D. Composite units formed solely through multiplication, with the prefix usually added to the first element of the composite unit
B. When using prefixes to form multiple units, overlapping prefixes shall not be used. C. For non-decimal units, prefixes shall not be used to form multiple units. D. For composite units formed solely by multiplication, the prefix is usually added to the first element of the composite unit