封闭式基金客户承担的费用主要有（）
A.委托手续费
B.申购费
C.赎回费
D.佣金
E.过户费
参考答案：A, D, E
-- Do you think it's a good idea to make friends with your students?
-- ______, I do. I think it's a great idea.
A．Really
B．Obviously
C．Actually
D．Generally
小容量晶体管调速器电路中的电压负反馈环节由（）、R3、RP6。
A、R7
B、R9
C、R16
D、R20
