●Adding 5 people to a 4 person team increases the communication channels by a factor of (75).
(75) A. 3 times
B. 4 times
C. 5 times
D. 6 times
在题74图(c)所示电路中,设RE1=75Ω,RB2=5Ω,RC=4Ω,RE=1Ω,三极管的β=50,UBE=0.7V,UCC=12V,求
(1)电路的静态工作点;
(2)电压放大倍数、输入电阻和输出电阻。
A.i=1
B.i=2
C.i=3
D.i=4
A.75
B.76
C.77
D.84
此题为判断题(对,错)。
(4)
A. 15
B. 20
C. 30
D. 40
在窗体中添加一个名为Command1的命令按钮,然后编写如下事件代码: Private Sub Command1_Click() a=75 If a>60 Then k=1 ElseIf a>70 Then k=2 ElseIf a>80 Then k=3 ElseIf a>90 Then k=4 EndIf
A.1
B. 2
C. 3
D. 4
设某散列表的当前状态如下: 该散列表的负载因子约为
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 190 75 194 768 559 582 393 208
A.0.27
B.0.42
C.0.58
D.0.73
Spread spectrum simply means that data is sent in(1 )pieces over a number of the discrete frequencies available for use at any time in the specified range.Devices using(2 ) spread spectrum(DSSS)communicate by splitting each(3 )of data into several parts and sending them concurrently on different(4 ),DSSS uses a lot of the available(5 ),about 22 megahertz(MHz).
第71题:文中(1 )处正确的答案是()。
A.small
B.high
C.low
D.long
Microwave communication uses(1 )frequency radio waves that travel instraighdine sthroughthe air.Because the waves cannot(2 )with the curvature of the earth,they can be (3 )onlyover short distance.Thus,microwave is a good(4 )for sending data between bulldingsin a city or on a large college campus.For longer distances,the waves must berelayed by means of“dishes”or(5 ).These can be installed on towers,highbuildings,and mountain tops.
第71题:文中(1 )处正确的答案是()。
A.high
B.10w
C.1ong
D.short