单项选择题
A.5%~10%B.5%~12%C.6%~12%D.6%~14%
A.1B.2C.3D.4
A.1.0~1.2B.1.2~1.4C.1.4~1.6D.1.6~1.8
A.1-2个B.2-3个C.3-4个D.4-5个
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