公安网计算机不可以接入（）等网络。
A、政务网
B、党务网
C、消防信息网
D、互联网
E、涉密网
参考答案：A, B, D, E
I have ______ for 10 years. I always ______ my classmates. [ ]
A. graduated; keep in touch with
B. graduated; keep up with
C. been away; keep in touch with
D. been away; keep up with
物料需求计划是指 （）
A、MRP
B、MRPII
C、ERP
D、MPS
