A:30°
B:45°
C:60°
D:90°
-- Daniel, your books are in a terrible mess on your desk.
-- Really sorry. I’ll _________ right now.
下列关于法兰西共和国总统的叙述不正确的是
示波器是电子技术实验测量中常用的仪器,若示波器中显象管的电子枪在2s内发6×1013个电子,则示波管中电流强度大小为 ( )
The city was founded in the 8th century BC. In 89 BC, the Romans ____ Pompeii.