华为AR与华为BR之间互连使用POStrunk链路，POS端口在IP-TRUNK中协议封装为（）
参考答案：HDLC
—Shall we go to the cinema this evening?
—_______.[ ]
A. Yes, we shall
B. Shall we?
C. That's a good idea.
D. Yes, I agree.
切削加工工艺过程
