教师在教学中运用的直观教具可以分为两类：一类是实物直观，另一类是＿＿＿＿。
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美国总统在台湾问题上，实际采取了维持现状的政策，美国获取了最大的国家利益。
A. 正确
B. 错误
When policy - based routing (PBR) is being configured, which three criteria can the set command specify?（）
A. all interfaces in the path toward the destination
B. all networks in the path toward the destination
C. adjacent next hop router in the path toward the destination
D. all routers in the path toward the destination
E. all interfaces through which the packets can be routed
F. type of service and precedence in the IP packet
手机支付比视频点播对时延更为敏感。
A. 正确
B. 错误
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