A:break away from
B:get away with
C:get away from
D: get rid of
已知fx为R上奇函数,当x≥0时,fx=x2+2x,则当x<0时,fx=( ).
所记录的实验数据如下表:
加热时间/min
0
1
2
3
4
水的温度/℃
30
32
34
36
38
沙子的温度/℃
42
48
54
— Smart phones are more and more popular now.
— So they are. But they still ________ too much.