MIDI enables people to use （1） computers and electronic musical instruments . There are actually three components to MIDI, the communications " （2） ", the Hardware interface and a distribution （3） called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （4） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （5） are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.
（1）A、personal
B、electronic
C、multimedia
D、network
（2）A、device
B、protocol
C、network
D、controller
（3）A、format
B、text
C、wave
D、center
（4）A、Video
B、Faxmail
C、Graphic
D、Audio
（5）A、messages
B、packets
C、frame
D、information

我國(guó)“天河一號(hào)”超級(jí)計(jì)算機(jī)的計(jì)算速度為2．507PFlops。這里PFlops的P代表l0的15次方，那么該浮點(diǎn)運(yùn)算速度為每秒鐘（　?。?br />A.2．507萬(wàn)億次
B.2．507百萬(wàn)億次
C.2．507千萬(wàn)億次
D.2．507億億次

地址編號(hào)從80000H到BFFFFH且按字節(jié)編址的內(nèi)存容量為（ 1）KB,若用16K*4bit的存儲(chǔ)芯片夠成該內(nèi)存，共需（2 ）片。
（1）.
A.128
B.256
C.512
D.1024
（2）.
A.8
B.16
C.32
D.64

如果路由器顯示“Serial 1 is down，line protocol is down”故障信息，則問(wèn)題出在OSI參考模型的（58） 。
A．物理層    
B．?dāng)?shù)據(jù)鏈路層
C．網(wǎng)絡(luò)層  
D．會(huì)話層

3DES 的密鑰長(zhǎng)度為（ ）。
A．56
B．112
C．128
D．168