-4的倒数是( )
A:-4
B:4
C:14
D:-14
- I am thinking of going back to school to get another degree.
- Sounds great! _____
在函数y=x-4中,自变量x的取值范围是____
下图中①示肱二头肌,②示肱三头肌。完成屈肘动作需( )