单项选择题
A.0.6~0.75 B.0.7~0.85 C.0.8~0.95
A.大于 B.等于 C.小于
A.3～5％ B.3～5‰ C.3～5
A.0.38～0.4 B.0.45～0.7 C.0.5～0.8
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