题目内容

Whichofthefollowingistheprimarypurposeofimpedancematchedvolumecontrol？（）

A. Maintainsproperspeakerphase
B. Protectstheamplifierfromdamage
C. Protectsthedigitalsystemsfromdamage
D. Amplifiesthespeakersignal

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Which of the following is an invalid IPv4 address？（）

A. 225.0.0.1
B. 254.254.0.0
C. 256.0.0.4
D. 224.2.1.4

Which of the following is the appropriate interface to connect an optical mouse and keyboard to a computer？（）

A. IEEE1394
B. USB
C. Serial
D. eSATA

A company has recently received a new ADSL backup Internet connection. Which of the followingwill MOST likely be used between the modem and the ISP？（）

A. PPPoE
B. RAS
C. IPSec
D. MSCHAP

钢经淬火后处于硬脆状态。（)