单项选择题
A.4.9%,4.6%,5.7% B.4.6%,5.7%,4.9% C.4.6%,4.9%,5.7% D.4.9%,5.7%,4.6%
A.50Kg B.70Kg C.60Kg D.以上都不对
A.20W-40W B.10W-30W C.15W-40W D.15W-30W