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【多选题】
在对科学教活动方案进行材料设计时,所提供的材料需要注意至少()等几个方面A.
注重所提供材料的多样性
B.
注重所提供材料的严谨性
C.
注重所提供材料的结构性(层次性)
D.
注重所提供材料的数量要适宜
E.
精心进行材料投放
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【简答题】按照凯恩斯主义观点，增加储蓄对均衡收入会有什么影响？
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