某段电路中，每通过5库电荷，电流做功30焦，这段电路两端电压为______伏．
这段电路两端电压为：
U=WQ=30J5C=6V．
故答案为：6．
--- It’s already 10 years since we parted from school. Shall we have a get-together this month?
--- ________.
A．It’s a pleasure.
B．That’s all right.
C．It’s very kind of you.
D．I can’t agree more.
陶瓷原料分哪几类？
