变压器在运行中除承受长时间的工作电压外,还要承受大气过电压和操作过电压的作用
参考答案:对
—I wonder if you could go to the movie with me.
—Oh, just leave me alone. I _______ a composition all the morning and haven’t finished yet.
A.write
B.was writing
C.have written
D.have been writing
龙舌兰是生产特基拉酒的主要原料。