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【单选题】
加速原理发生作用的条件是（）。A.
投资的增加会导致国民收入增加
B.
消费品的生产需要有一定数量的资本品，因而消费支出的增加会导致投资支出的增加
C.
投资的增加会导致消费支出的持续增加
D.
投资支出的减少会造成消费支出地减少
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