单项选择题
A.1/5 B.1/4 C.1/3 D.1/2
A.150mm B.200mm C.350mm D.400mm
A.1/4 B.1/3 C.1/2 D.3/4
A.10﹪ B.15﹪ C.20﹪ D.25﹪
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