题干
I want to make a cup of milk shake, can you the blender for me?
A：turn on
B：turn down
C：turn off
D：turn up
答案(点此获取答案解析）
A
I want to make a cup of milk shake, can you the blender for me?
A：turn on
B：turn down
C：turn off
D：turn up
满足
，且
的导函数
，则
的解集为（ ）
