A:3m
B:33 m
C:35 m
D:4m
如图所示,在探究“斜面的机械效率”的实验中,以下说法错误的是( )
(参考数据:sin20°≈0.3420,cos20°≈0.9397,精确到0.1m).
Most Brazilians get along well with each other, _________ they are from different races(种族), including Americans, European settlers, and Africans.
2004年是农历的羊年,我国有崇拜羊的习俗,古人的艺术作品中常有反映。如图是名闻中外的青铜器精品,它的名字是( )