This is the novel _______ is written by Zheng Yuanjie.
A:who
B:what
C:that
D:/
如图所示,汽车以速度v安全通过一弧形的拱桥顶端时,关于汽车受力的说法中正确的是( )
I was told to finish the work in three ______time.
若向量a→=(3,1),b→=(0,﹣2),则与a→+2b→共线的向量可以是( )