- I think Maths is really interesting.
- . I like Maths best.
A:Me, too
B:Good idea
C:I'm sorry
D:I don't think so
当桑树的茎折断时,折枝断面上渗出的白色汁液是从哪里流出来的( )
设向量a→,b→满足|a→|=1,|a→﹣b→|=3,a→•(a→﹣b→)=0,则|2a→+b→|=____
在△ABC中,∠A=120°,∠B=45°,∠C=15°,则cosB等于( )
下列搭配错误的是( )