In BGP routing， what does the rule of synchronization mean？（）
A BGP router can only advertise an EBGP learned route， provided that the route is an IGP route in the routing table.
B. A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route in the routing table.
C. A BGP router can only advertise an IBGP learned route， provided that the route is an IGP route that is not in the routing table.
D. A BGP router can only advertise an EBGP learned route， provided that the route is a metric of 0 in the BGP table.
在没有规定标准仪表离场程序的机动，常用的仪表飞行离场方法是（）。
A. 过台入航和通场入航
B. 过台入航和直接入航
C. 过台入航和旁切入航
贝赫切特（白塞）综合征指在复发性口疮的同时或先后交替出现有（）。
A. 口干、眼干等症状
B. 口周皮肤，粘膜色素沉着
C. 张口受限，关节弹响声
D. 颌面部皮肤沿三叉神经分布区的小疱疹
E. 眼、外生殖器以及皮肤等溃疡
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