涡轮增压控制系统是利用()推动增压器工作的。
参考答案:发动机排出的废气
It's difficult for me to decide which one to choose, because ______ of them are good. [ ]
A. neither
B. both
C. either
D. each
设有如下定义: int a=4; 则计算表达式“a+=a-a*a”后的值是( )。
A) 0 B) -12 C) -24 D) -8