UNIX的第一个版本Version1是在______计算机上开发的。( )
A．PDP-5
B．PDP-6
C．PDP-7
D．PDP-8
参考答案：C
Mr. Zhang is the best music teacher in our school, but he has hurt his left foot and cannot ________tomorrow's concert.
A．take part
B．play a part in
C．participate in
D．participate
QDII基金申购、赎回的币种只能是人民币。( )
