【单选题】决定局域网的主要技术,涉及拓扑结构、传输介质和()。
【多选题】Which two statements are true when row archival management is enabled?()
A.
The ORA_ARCHIVE_STATE column visibility is controlled by the ROW ARCHIVAL VISIBILITY session parameter.
B.
The ORA_ARCHIVE_STATE column is updated manually or by a program that could reference activity tracking columns, to indicate that a row is no longer considered active.
C.
The ROW ARCHIVAL VISIBILITY session parameter defaults to active rows only.
D.
The ORA_ARCHIVE_STATE column is visible if referenced in the select list of a query.
E.
The ORA_ARCHIVE_STATE column is updated automatically by the Oracle Server based on activity tracking columns, to Indicate that a row is no longer considered active.
【单选题】Which parameter, when enabled on a standalone access point, gives the highest priority to a voicepacket even when QoS is not enabled?()
C.
QoS Element for Wireless Phones
D.
AVVID Priority Mapping
【单选题】Which parameter, when enabled on a standalone access point, gives the highest priority to a voice packeteven when QoS is not enabled?()
A.
QoS Element for Wireless Phones
D.
AVVID Priority Mapping
【简答题】乙醇的工业制法 :粮食发酵法和乙烯水化法 1. 发酵法 淀粉 → 葡萄糖 → C 2 H 5 OH 发酵液中乙醇的质量分数约为 6% ~ 10 %,经精馏可得 95% 的工业乙醇。含乙醇 以上的叫无水酒精。用工业酒精与 混合,再经 的方法得到无水乙醇。 2 .乙烯水化法 CH 2 = CH 2 + H 2 O → C 2 H 5 OH所用的乙烯可以大量来自于石油的裂解。 3 . 乙醇 用作 、 、...
【简答题】乙醇(C 2 H 5 OH)俗称酒精,属于可再生能源,医院可用体积分数为75%酒精(含有体积分数为25%的水)来消毒.某兴趣小组将大小相同的若干棉布在5份不同体积分数的酒精溶液中浸透后取出点火,做了烧不坏的棉布“试验.其试验结果记录如下: 试验序号 ① ② ③ ④ ⑤ 所用酒精的体积分数 95% 65% 55% 15% 5% 实验现象 酒精烧完 棉布烧坏 酒精烧完 棉布无损 酒精烧完 棉布无损 不...
【简答题】决定局域网的主要技术涉及拓扑结构、传输媒体和介质访问控制(MediumAccessControl,MAC)等三项技术问题,其中最重要的是()。
【单选题】When enabled, which feature prevents routing protocols from sending hello messages on an interface?