单项选择题
A.0.02 B.0.03 C.0.04 D.0.05
A.103%~106% B.106%~109% C.109%~110% D.111%~112%
A.3%~6% B.6%~9% C.9%~10% D.10%~12%
A.2400 B.2600 C.2800 D.3000
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