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单项选择题

反动度是（）。

A.动叶通道中理想焓降与该级总的理想焓降之比
B.动叶通道中实际焓降与该级总的理想焓降之比
C.动叶通道中实际焓降与该级总的实际焓降之比
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Top Co has total receivables outstanding of 28,000. No previous allowance has been made for receivables.
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