—You haven’t been to the West Lake, have you?

—_____. But I will go there with my parents this summer vacation.

A．No, I haven’t

B．No, I didn’t

C．Yes, I have

D．yes, I did

变频电炉电源可供选择的频率范围很宽、变换效率高、功率因数也高，起始送电功率就可以满负荷运转，大大节省了熔化时间。