浅层气的存在可能有哪些特点？及其危害？

A. 进出官腔时吸管不能带负压
B. 宫腔四壁光滑表示宫内组织已吸尽
C. 吸出物要过滤检查有无绒毛或胎儿
D. 子宫肌瘤合并妊娠，易致组织残留
E. 危害最大的并发症为子宫穿孔

A. MPLS eliminates the need of an IGP in the core.
B. MPLS reduces the required number of BGP-enabled devices in the core.
C. Reduces routing table lookup since only the MPLS core routers perform routing table lookups.
D. MPLS eliminates the need for fully meshed connections between BGP enabled devices.

A. 正确
B. 错误