No one knows what _______ in fifty years.
A:will our life be like
B:is our life like
C:our life will be like
D:our life is like
已知:如图,AD、BE分别是△ABC的中线和角平分线,AD⊥BE,AD=BE=6,则AC的长等于____ .
Don't stand too close to North Americans. You'd better give them more personal ___ .
①正方形的平行投影一定是菱形;②平行四边形的平行投影一定是平行四边形;③三角形的平行投影一定是三角形.