单项选择题
A.基本稳定 B.越来越快 C.波浪起伏
A.1.85倍 B.2倍 C.2.25倍 D.3倍
A.5.67% B.8.74% C.10.49% D.16.13%
A.2.1% B.2.9% C.2.05% D.4%
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