单项选择题
A.62.9%,5.23% B.62.9%,4.22% C.65.6%,4.23% D.65.6%,5.23 %
A.497.6 B.502.27 C.506.32 D.510
A.4.8×104 B.5.2×104 C.5.9×104 D.6.2×104