题目

— Have you _______ some new ideas?— Yeah. I'll tell you later. A . come about B . come into C . come up with D . come out with 答案：C下列各组仪器中，可以用来测量功率的是（ ）①电能表和秒表；   ②电能表和电压表；  ③电能表和电流表；  ④电流表和电压表．A．①②B．③④C．①④D．②③④