单项选择题
A.5‰ B.3.5‰ C.1‰ D.2.5‰
A.10000;10000 B.5000;5000 C.2000;2000 D.50000;50000
A.1% B.2% C.5‰ D.1‰
A.1% B.2% C.5‰ D.10%
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