为什么要注水开发？

A. 溢流井
B. 排空井
C. 跌水井
D. 检查井

A. 支持现有通信业务以及未来的新业务
B. 面向连接的技术，不存在N平方问题
C. 减少了中间节点的处理时间，支持高速传输
D. 能保证各种业务的服务质量性能指标（QOS）

A. The distance between the actual center of gravity and the maximum center of gravity that will still allow a positive stability
B. The point to which G may rise and still permit the vessel to possess positive stability
C. The sum of the center of buoyancy and the center of gravity
D. The transverse shift of the center of buoyancy as a vessel roll