單項(xiàng)選擇題下列無(wú)線局域網(wǎng)協(xié)議標(biāo)準(zhǔn)中,傳輸速率最快的標(biāo)準(zhǔn)是 ()。

A.802.11a
B.802.11g
C.802.11n
D.802.11b


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1.單項(xiàng)選擇題雙絞線將兩根絕緣的導(dǎo)線互相絞在一起,最主要目的是()。

A.增加導(dǎo)線強(qiáng)度
B. 降低信號(hào)干擾
C.增加傳輸距離
D. 屏蔽輻射

2.單項(xiàng)選擇題()are Internet addresses used by Web browsers to locate I nternet resources.

A. HTTP
B. URLs
C. DNS
D. HTML

3.單項(xiàng)選擇題A user typically connects to the Internet in one of two ways: dedicated access and()access.

A. broadcasting
B. point-to-point
C. dial-up
D. Internet

4.單項(xiàng)選擇題The Internet is based on the concept of a (an) ()relationship between computers.

A. browser/server
B. client/customer
C. entity/relationship
D. client/server

5.單項(xiàng)選擇題關(guān)于機(jī)房消防設(shè)施,不正確的是()。

A.機(jī)房的吊頂?shù)纳?、下及活?dòng)地板下,均應(yīng)設(shè)置探測(cè)器和噴嘴
B.設(shè)有固定滅火系統(tǒng)時(shí),只采用感溫探測(cè)器
C.主機(jī)房出口應(yīng)設(shè)置向疏散方向開(kāi)啟且能自動(dòng)關(guān)閉的門
D.機(jī)房?jī)?nèi)存放廢棄物應(yīng)采用有防火蓋的金屬容器