PTN的各种业务都是是通过伪线承载的,而伪线是要和隧道绑定的,所以要创建各种PTN业务,都需要先创建隧道,然后创建伪线绑定隧道,最后再创建各种PTN业务绑定伪线
参考答案:对
His son has been late three times _______ the morning of last Thursday. [ ]
A. in
B. on
C. since
D. until
光轴零件最多能被消除()自由度。
A.三个
B.四个
C.五个
D.六个