A.9B.8C.2D.1
A.9B.6C.4D.1
A.高層扇出系數(shù)小,中間扇出系數(shù)大,底層扇入系數(shù)大B.高層扇出系數(shù)大,中間扇出系數(shù)小,底層扇入系數(shù)小C.高層扇入系數(shù)大,中間扇出系數(shù)小,底層扇入系數(shù)大D.高層扇出系數(shù)大,中間扇出系數(shù)小,底層扇入系數(shù)大