单项选择题
A、C3A B、C4AF C、C3S和C4AF D、C2S
A、C3A B、C4AF C、C3S D、C2S
A、C4AF>C3A>C3S>C2S B、C3A>C3S>C4AF>C2S C、C3A>C4AF>C3S>C2S D、C3A>C4AF>C2S>C3S
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