关于胆囊癌的叙述，下列错误的是（）。

A.约1／3胆囊癌并存胆囊结石

B.多发生在胆囊颈部

C.以硬性腺癌较多见

D.男性多发

E.预后较好

Routing protocols use different techniques for assigning ______ to individual networks. Further, each routing protocol forms a metric aggregation in a different way. Most routing protocols can use multiple paths if the paths have an equal ______ . Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load ______ can improve overall allocation of network bandwidth. When multiple paths are used, there are several ways to distribute the packets. The two most common mechanisms are per-packet load balancing and per-destination load balancing. Per-packet load balancing distributes the ______ across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on ______.

A. jitter B. entity C. respond time D. cost