单项选择题
A.2A B.3A C.4A D.≤6A
A.0.5 B.0.7 C.0.8 D.0.9
A.5 B.8 C.15 D.10
A.0.1~0.6 B.0.1~0.65 C.0.01~0.65 D.0.01~0.7
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