A:直角三角形
B:等腰三角形
C:等腰直角三角形
D:等腰三角形或直角三角形
小刚把书架收拾的非常整洁,他应该感到( )
Look!The bear under the tree.
—Whose book is this? There is no name on it. —Let me see. Oh, it's . I lost it a few days ago.
在A点(0°,0°),正西方的是( )