单项选择题
A.2.2A~2.86A B.2.3A~2.9A C.4.5A~6.75A D.7.8A~8.7A
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
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