单项选择题
A.C1~C9 B.C2a C.C3a、C5a、C4a D.C3、C4、CR1 E.C3b
A.C2a B.C5a C.C4a D.C4b E.C3b
A.1% B.2% C.3% D.4% E.5%
A.1~2% B.3~4% C.5~7% D.6~8% E.7~9%
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