A:K+、MnO4-、SO42-、NO3-
B:Na+、I-、ClO-、K+
C:Fe3+、SO42-、Na+、SCN-
D:Ba2+、HCO3-、Cl-、OH-
______ we guess, the man wearing dark-glasses is a detective for this murder case.
袁隆平院士利用野生水稻与普通栽培水稻多次杂交,培育出高产杂交水稻品种,这是利用了( )