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四词冠的选择和使用规则1.选用十进词冠时,应使所表示的量值在0.1和1000之间。例如3.5×10~4N,可选用词头k,记作35kN。但对某些表格或论文,由于必须使用同一单位,或在机械制图中习惯采用mm(毫米)为单位时,可不受此限制。应注意以下情况: ①质量单位中,基本单位是已加词冠的千克(kg),故应在克(g)之前加词冠。例如mg(毫克)=10~(-6)kg ②对于带SI词冠的单位,国际标准ISO
Four-word choice and use of the rules of the crown 1. Selection of the ten-word crown, the magnitude should be expressed between 0.1 and 1000. For example 3.5 × 10 ~ 4N, optional prefix k, recorded as 35kN. However, for some tables or papers, the same unit must be used, or when it is customary to use mm (millimeters) in mechanical drawing, this is not a limitation. Should pay attention to the following situations: ① quality unit, the basic unit is the prefix has been added kilograms (kg), it should be grams (g) before the word crown. For example mg (mg) = 10 ~ (-6) kg ② For units with SI word prefix, the international standard ISO