解方程:
7.9×3+3x=36.
7.9×3+3x=36,
23.7+3x=36,
23.7+3x-23.7=36-23.7,
3x÷3=12.3÷3,
x=4.1.
下列基因型中哪一项是纯合体[ ]
A.BbDD
B.DdCc
C.EERr
D.AAbb
动植物性包装物、铺垫材料进境时应当及时报检()