A、总体比例
B、总体比例的1／n
C、总体比例的<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg" width="37" height="24" />
D、总体比例的<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/0855b70a-25b6-42e7-88a6-64b3bc781fda.jpg" width="36" height="38" />
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