PSEU内的两套系统（）。
A.相互独立
B.接收的信息共享
C.接收的信息部分共享
D.上述说法均不正确
参考答案：B
90 % of the debts _______ so far.
A．is paid back
B．have been paid off
C．has been paid off
D．are paid off
In relation to the contents of a contract explain the following:
(c) warranties; (3 marks)
