A:a
B:which
C:who
D:that
下列关于力的说法中,不正确的是
根据下式回答:
看图读一读,连线。
① ____ A. Do you like ice cream? - Yes, I like ice cream.
② ____ B. Taste the noodles, Tom. Yummy.
③ ____ C. What do you hear? I hear a cat.
④ ____ D. What do you see? I see a bird. It's yellow.
已知关于x的一元二次方程x2+kx+1=0有两个相等的实数根,则k=____ .