未分类题

根据下面的文字资料回答 2～3 题在双绞线布线后要进行测试，一般情况，下面（ 1 ）不是测试的项目。光纤测试的内容不包括（ 2 ）项目。
第2题：文中（ 1 ）处正确的答案是（ ）。

A.近端串扰
B．拓扑结构
C．开路或短路
D．错对

【参考答案】

B
在双绞线布线后进行测试的项目有近端串扰、开路或短路、是否错对。拓扑结构则不是其测试项目；光纤测试......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)
<上一题 目录 下一题>
热门 试题

单项选择题
听力原文：Hello! We will shortly be arriving in Southampton. For safety, may I advise passengers when returning to the car deck, to hold the hand rails and take extreme care at all times. I'd like to remind passengers that smoking is strictly forbidden and drivers are requested not to start their engines until instructed. Please ensure that car doors are closed and refrain from using mobile phones before the deck is lowered. Foot passengers are requested to remain seated until the ship is alongside. Thank you for traveling with Red Funnel and wish you all a safe onward journey.What is the main purpose of this announcement?A．Announcing the arrivalB．Reminding passengers of safety issuesC．Introducing the Southampton HarborD．Warning passengers of theft
A.
What
B.Announcing
C.Reminding
D.Introducing
E.Warning
未分类题
根据下面的文字资料回答 54～55 题在缺省配置的情况下，交换机的所有端口（ 1 ）。连接在不同交换机上的，属于同一VLAN的数据帧必须通过（ 2 ）传输。 第54题：文中（ 1 ）处正确的答案是（ ）。
相关试题