单项选择题
A.5~8mmB.4~7mmC.4~8mmD.5~7mm
A.3%B.4%C.5%D.6%
A.10~15B.15~20C.20~25D.25~30
A.1~1.5B.1.5~2C.2~2.5D.2.5~3
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