计算机的运算控制单元是计算机的核心，简称（）。
A.CPU
B.PUC
C.UPC
D.CPC
参考答案：A
--- ________ will win the first place in the relay race?
--- I don’t know.
A．Do you think who
B．Do you think which class
C．Which class do you think
D．Whom do you think
防锈铝合金中，主要作用是提高抗蚀性能，并起固溶强化作用的元素是( )。
A．锑
B．镁
C．锰
D．钛
