搜题请搜索小程序“爱下问搜题”
问题 单项选择题

函数f（x）=5x在区间[-1，1]上的最大值是（）

A.A

B.B

C.C

D.D

答案

参考答案：D

解析：

f(x)=5x，f'(x)=5xln5＞0，可知f(x)在[-1，1]上单调增加，最大值为f(1)=5，所以选D.

单项选择题

心脏骤停时的心电活动2/3是（）.

A.室颤

B.房颤

C.心电机械分离

D.室上速

E.室速
查看答案
听力题

短文首字母填空

Only Mother Love is t   小题1:   love. It gives everybody everything all his life. When you are still a b    小题2: , mother takes good care of you as much as p   小题3: . In your waking hours, she always holds you in her a  小题4:  . When you are ill, she stops her work right now to look after you day and night and forgets about h  小题5:  . When you are growing up day by day, she feels very happy. When you are old enough to go to school, mother still looks after you all the time. On cold winter days, she always tells you to put on m 小题6:   clothes. She always stands in the wind waiting for your back from school. When you hurry to leave home w  小题7:  little breakfast, she always feels worried about you at home. She usually knows about your study and spends much money on your school things. When you do well at school, you will see the brightest s   小题8:  on her face.

Mother is always ready to give e  小题9:   she has to her children, not to r  小题10: . What true love it is in the world! We will remember Mother Love for ever!
查看答案