开具发票应当按照规定的()如实开具，并加盖单位财务专用章或者发票专用章。
A.时限
B.顺序
C.逐栏
D.全部联次一次性
参考答案：A, B, C, D
—Did you wash your clothes?
—No, I was going to wash my clothes but I ______ visitors. [ ]
A. have had
B. have
C. had
D. will have
对于发电厂电压监视控制点，值班员应保持500kV母线电压在（）kV至（）kV之间。
