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宋咸平中职方在有数子弟皆幼因相戏以一钓竿垂钩用枣作饵登陆钓鸡雏一子学之而误吞其钩至喉中急引之而钩须已逆不能出命不手大怖遍问老妇必能经历一老妇人年余九十岁未尝见此切（窃）料有识者可出之时郡中性甚巧令闻呼老妇责之曰吾子误吞钩出之老妇曰闻医者意也曾在水中打碑塔添悦亲属勉之曰试询之遂召至沉思良久曰要得一蚕茧及念珠一串公与之都料遂将茧剪如柔其四面以油润之中通一小窍贯之钩线次贯念珠三五枚正坐开口渐加念珠引之至喉觉至系钩处用力向下一推其钩已下而向上急出之见茧钱向下裹定钩须须臾而出并无所损大喜赂之明者意必大巧意必善医。（《医方考·喉闭门》）本文主要说明（）的道理。
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举一反三
【单选题】Hub and spoke systems are characterized by:
A.
"spokes" that are represented by the sites that receive the goods.
B.
"hubs" that hold inventory until the appropriate season or upswing in demand.
C.
inventory locations that are close to producers, not customers.
D.
warehouses that are purely sorting facilities.
【单选题】When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）
A.
hub and spoke
B.
PE
C.
CE
D.
hub
E.
spoke
【单选题】What is the advantage of using a multipoint interface instead of point-to-point subinterfaces when configuring a Frame Relay hub in a hub-and-spoke topology?（）
A.
it avoids split-horizon issues with distance vector routing protocols.
B.
IP addresses can be conserved if VLSM is not being used for subnetting.
C.
A multipoint interface offers greater security compared to point-to-point subinterface configurations.
D.
The multiple IP network addresses required for a multipoint interface provide greater addressing flexibility over point-to-point configurations.
【简答题】Hub and spoke routing model is more ________________________ in terms of resource allocation for the airline.
【多选题】What are three key concepts that apply when configuring the EIGRP stub routing feature in a hub and spoke network？（）
A.
A hub router prevents routes from being advertised to the remote router.
B.
Only remote routers are configured as stubs.
C.
Stub routers are not queried for routes.
D.
Spoke routers connected to hub routers answer the route queries for the stub router.
E.
A stub router should have only EIGRP hub routers as neighbors.
F.
EIGRP stub routing should be used on hub routers only.
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