题目内容
在酸性溶液中，在适量的KMnO4 与Na2SO3反应时出现的现象是（）
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在弱碱性溶液中，当适量的，KMnO4与Na2SO3反应时出现的现象是（)
下列金属离子的溶液在空气中放置时，易被氧化变质的是（ ）
Complete the sentences, using words or phrases in brackets. Make additions and changes where necessary:1) ____________________an enemy forces much superior to ours, we had to give up ____________ big cities and retreat to the rural and mountainous ______________ to build up our base.
2) Unity is __________ the ____________ operation of an organization. Failure ____________ this problem will ___________ its strength. In many cases, work may ____________ by constant internal struggle in an organization.
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