科学家的观点往往是根据事实提出的,在科学探究过程中,注意区分事实和观点是十分必要的,以下属于事实的是( )
下图是李奶奶养的鸡、鸭、鹅情况统计表。请你算一算鹅在扇形统计表中的圆心角是____ °
⑴What is this? ____ A. Thursday.
⑵What are these?____ B. Yes, it is.
⑶What is she wearing?____ C. They're shorts.
⑷Is this a new cap?____ D. She is wearing a blue skirt.
⑸What day is today?____ E. It's a new T-shirt.
一元二次方程 3x2−3x=x+2 化为一般形式 ax2+bx+c=0 后, a,b,c 的值分别是( )