单项选择题
A.0.5%〜2%B.2.5%〜3.5%C.4%D.5%〜6%
A.0.5%〜1.5%B.2%〜3%C.3%〜4%D.4%〜5%
A.2%~4%B.5%~7%C.10%~15%D.20%~30%
A.80B.100C.120D.150
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