A.4~10岁B.5~9岁C.6~13岁D.7~12岁
A.≤0.3B.≤1C.≤0.2D.≤0.05
A.45.82%和45.69%B.50.82%和50.69%C.30.32%和30.42%D.40.82%和40.69%