在△ABC中,AB=12,AC=10,BC=9,AD是BC边上的高.将△ABC按如图所示的方式折叠,使点A与点D重合,折痕为EF,则△DEF的周长为 ( ▲ )A.9.5B.10.5 C.
英法联军在广州实行的殖民统治结束于 A.1857年 B.1858年 C.1859年 D.1860年
Everyone should fight for the_______ of their own country. A. favour B. reward C. honour D. prize
如图所示,在直角坐标系的方格纸中将△DEF经过平移、旋转、翻折等变换得到△OPQ.写出变换步骤,并画出相应的图形,在变换过程中,顶点必须在格
If the drought in Southwest China, the crops will be ruined. Worse still, both people and animals will be threatened with a lack of drinking water. A.keep to B.dee
I need ________ bananas to make fruit salad. Could you please buy some?A.fewB.a fewC.littleD.a little
1.若等差数列{an}的前3项和S3=9且a1=1,则a2等于A.3 B.4 C.5 D.6
在我国每个公民增强守法意识、树立法制观念,都应首先增强遵守宪法、维护宪法的意识。作为青少年,应当 ①认真学习宪法,了解宪法的性质和基本