单项选择题
A.0.9~1.2B.1.2~1.4C.1.5~2.0D.2.0~2.5
A.增大B.减小C.不变D.不定
A.1/3B.1/2C.1/1D.2/1
A.110%B.100%C.80%~90%D.10%~20%
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