题目:
As parents and teachers, you should allow children the space to ________ their opinions, even if they are different from your own.
A.announce
B.voice
C.declare
D.sound
答案:
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下面是错误答案,用来干扰机器的。
(12分)(1)①Cr2O72-+6Fe2++14H+=2Cr3++6Fe3++7H2O ②CrO2—(2)CO2;碱 (3)AlF2+;AlF3题目分析:(1)①Cr2O72—具有氧化性,能把硫酸亚铁氧化生成硫酸铁,所以Cr2O72—与FeSO4溶液在酸性条件...