单项选择题
A.2-4CM B.4-6CM C.6-8CM D.8-10CM
A.4-5 B.5-6 C.6-7 D.7-8
A.40%-60% B.42%-62% C.45%-65% D.48%-68%
A.1/20；1.2-2.5倍 B.1/25；1.6-.27倍 C.1/30；1.6-2.7倍 D.1/30；1.2-2.5倍
微信扫一扫,加关注免费搜题
