A:①②
B:②③
C:②④
D:①④
某反应的微观示意图如下,下列说法错误的是( )
⑴You need a swimming cap. ____
⑵First,you should wash yourself. ____
⑶Next,you should do warm-up exercises. ____
⑷Then, you can enjoy your swimming lessons. ____
⑸You need a swimsuit.____
A. B. C. D. E.
已知x,y的取值如下表所示:
x
2
3
4
y
6
5
如果y与x呈线性相关,且线性回归方程为y∧=bx+132,则b=( )