单项选择题
A.+10%,-10% B.+7%,-10% C.+10%,-7% D.+7%,-7%
A.0区 B.1区 C.2区 D.附加2区
A. B. C.1.3 D.1.4
A.30%~60% B.10%~30% C.20%~30% D.60%~90%
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