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. 降低信號干擾
C.增加傳輸距離
D. 屏蔽輻射
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1.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
2.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