搜题请搜索小程序“爱下问搜题”
问题 多项选择题

以下哪些情况会引起无法检测到关到位信号的故障现象（）。

A.紧急解锁开关位置不正确

B.紧急解锁开关无法复位

C.关到位开关位置不正确

D.关到位开关无法复位

答案

参考答案：C, D

单项选择题

Routing protocols use different techniques for assigning (71) 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 (72) Some routing protocols can even use multiple paths when paths have an unequal cost. In either case, load (73) 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 (74) across the possible routes in a manner proportional to the route metrics. Per-destination load balancing distributes packets across the possible routes based on (75)

A．destinations

B．resources

C．packets

D．sources
查看答案
单项选择题

男性，35岁，慢性上腹痛1年半并出现上消化道出血1次，长期服用Hz受体阻滞剂无效，X线气钡双重造影示十二指肠降段多发性溃疡，空腹血清促胃液素测定为500pg/ml，诊断应考虑为

A．十二指肠球后溃疡
B．复合性溃疡
C．Zollingel—Ellison综合征
D．Crohn病
E．十二指肠球部溃疡活动期
查看答案