指定路由
参考答案:
发送方指定一信息包到达目的站点的路由,而这条路由是经过精心设计的、绕过设有安全控制的路由。
He __________ some cooking at that time, so ___________me.
A.did, heard
B.was doing, heard
C.was doing, didn’t hear
D.did, didn’t hear
产业间贸易