单项选择题
A.3 B.2 C.1 D.4
A.15° B.60° C.45° D.30°
A.自上而下 B.自下而上 C.自左而右 D.自右而左
A.9% B.7% C.8% D.6%
微信扫一扫,加关注免费搜题