正比例函数的图象一定经过的点的坐标为______.
∵正比例函数的一般形式为y=kx,
∴当x=0时,y=0,
∴正比例函数的图象一定经过原点.
故答案为:(0,0).
动词填空。
1. Amy enjoys (play) computer games at weekends.
2. The pretty girl _________ (not wear) glasses.
3. Let your brother __________ (sit) on the new sofa please.
4.Would your classmates like _________ (go) shopping with you?
5. Her mother usually ________ (do) some housework after supper.
6. ________ Mr. White ________ (teach) you English?
7. My father with me ________ (fly) a kite every Saturday.
8. Can your sister Millie ________ (ride) a bike?
9. The teacher is coming. _________(not shout) in the classroom.
10. The twins _________ (not be) good at playing football.
以下β受体阻滞剂中,哪一个是高水溶性的。而且主要通过肾排泄,不通过血脑屏障,其有效剂量容易控制()
A.普萘洛尔
B.阿替洛尔
C.美托洛尔
D.吲哚洛尔
E.以上都不是