进行买断式回购，交割时交易双方应有足额的债券和资金。( )
参考答案：对
I invited Joe and Linda to the party, and both of _______ came.
A．they
B．him
C．she
D．them
随机争用型的介质访问控制方法起源于( )。
A．ARPANET
B．TELENET
C．DATAPAC
D．ALOHA
