— Only five dollars. It's very cheap.
A: What time is it
B: How much do you want
C: How much is it
D: What's wrong
一辆汽车在平直的公路上匀速行驶,下列说法正确的是( )
(Ⅰ)写出图中三对相似三角形,并对其中一对作出证明;
(Ⅱ)连结FG,设α=45°,AB=4 2 ,AF=3,求FG长.
家中饲养小鸟时,小鸟生活需要下列哪些条件( )