单项选择题
A.C%=2.11% B.C%=0.77% C.C%=4.3% D.C%=6.69%
A.C%=2.11% B.C%=1.3% C.C%=4.3% D.C%=6.69%
A.C%=0.78% B.C%=1.3% C.C%=4.3% D.C%=6.69%
A.C%=0.78% B.C%=0.77% C.C%=4.3% D.C%=6.69%
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