EngineeringForm
 Usage
• EngineeringForm[expr] 用工程记数法输出 expr 中的所有实数.
• EngineeringForm[expr, n] 用n个数位的精度输出数据.
Notes
• 在"工程记数法"中指数总是以3的倍数进行排列.
• EngineeringForm使用与NumberForm相同的可选项，但使用与ExponentFunction不同的缺省函数. • 可以混合使用EngineeringForm和BaseForm. • EngineeringForm相当于一个"包裹"，它影响输出，而不影响赋值.
 Further Examples
Here are three numbers given in engineering format.
In[1]:=
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Out[1]//EngineeringForm=
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This specifies that exponents be multiples of 5.
It is possible to get the effect of ExponentStep using the ExponentFunction option, but the value of the ExponentFunction option necessary to do this requires several lines of code. The ExponentStep option is included to handle this common special case of the ExponentFunction option.
In[2]:=
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Out[2]//EngineeringForm=
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