—Linda is my good friend.
A:Who is she?
B:Who is your good friend?
C:Who is that girl?
“春来江水绿如蓝,能不忆江南”,使江水变绿的是下列哪种植物( )
给列字注音
倪____ 杲____ 羹____ 谙____
瞠____ 晁____ 鹧鸪____ ____
设x,y∈R,向量a→=x,1,b→=1,y,c→=2,-4且a→⊥c→,b→∥c→,则a→+b→=( )
赛车的比赛场地如图所示.赛车左、右两侧轮子间距为2米