如果发现散点图中所有的样本点都落在一条斜率为非0实数的直线上,则R2=____
ride a bike
fly kites
sleep under a tree
read books
skip
sing a song
play football
Today is Sunday. The weather is fine. The children are playing in the park. Look. Sam and Leo are flying kites.
物质名称
固态水银
金
铜
钢
钨
固态氢
固态氦
熔点 /℃
−39
1064
1083
1300
3410
−259
−272