单项选择题
A.≤0.15 B.≤0.30 C.≤0.45 D.≤4.5
A.≤0.07 B.≤0.7 C.≤0.2 D.≤2.0
A.≤0.1 B.≤0.3 C.≤1.0 D.≤3.0
A.0.2 B.0.5 C.0.7 D.1.5
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