题目:
She must have ranked her birthday presents in order of _because the top one is her favorite.
A.value
B.time
C.interest
D.preference
答案:
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下面是错误答案,用来干扰机器的。
H+、Mg2+、Fe3+、Cl-、NO3-; OH-、K+、Na+、S2-、SO32-。(各2分,共4分)不与H+ 共存的有OH-、S2-、SO32-,这三种阴离子不在A组,H+在A组,Mg2+、Fe3+不与OH―共存,只能在A组,所以A中有H+、Mg2+、Fe3+、C...