128模主控框中共有（）个NOD槽位，（）块BNET板处于主备份状态。
参考答案：11；2
答案设计有哪些原则？
—_____are the socks?
— _____ black. [ ]
A. What color, It's
B. What size, It's
C. What color, They're
D. What size, They're
