The blood types in human are inheritable. In ABO blood types system,IA and IB are all dominant to i. Which kind of marrying cann’t produce O type children under normal situation.
A.
type × O type
B.
type × O type
C.
A type × B type
D.
AB type × O type
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【单选题】用换元法解方程 5( x 2 -x) x 2 +1 + 2( x 2 +1) x 2 -x =6时,最适宜的做法是( )