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【简答题】
轴AB上作用一主动力偶，矩为M 1 ，齿轮的啮合半径R 2 ＝2R 1 ，如图4-5所示。问当研究轴CD的：(1)能否以力偶矩矢是自由矢量为由，将作用在轴AB上的力偶搬移到轴CD上?(2)若在轴CD上作用矩为M 2 的力偶，使两轴平衡，问两力偶的矩的大小是否相等?转向是否应相反?
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【多选题】Model test 2
A.
get
B.
know
C.
success
D.
about
E.
source
F.
gather
G.
origin
H.
speed
I.
somewhat
J.
value K existence L much M for N When O Soon after Who won the 1998 World Cup football games? What happened at the United Nations? How did the critics like the new play? ____________ (1) an event takes place, newspapers are on the streets giving the details. Wherever anything happens in the world, reporters are on the spot to ________ (2) the news. Newspapers have one basic purpose, to __________ (3) the news as quickly as possible from its source, from those who make it to those who want to _____________ (4) it. Radio, telegraph, television, and other inventions brought competition for newspapers. So did the development of magazines and other means of communication. However, this competition merely spurred the newspapers on. They quickly make use of the newer and faster means of communication to improve the ___________ (5) and thus the efficiency of their own operations. Today more newspapers are printed and read than ever before. Competition also led to newspapers branching out into many other fields. Besides keeping readers about informed of the latest news, today’s newspapers educate and influence readers about politics and other important and serious matters. Newspapers influence readers’ economic choices through advertising. Most newspapers depend on advertising for their very ___________ (6). Newspapers are sold at a price that fails to cover even a small fraction of the cost of production. The main _________ (7) of income for most newspapers is commercial advertising. The __________ (8) in selling advertising depends on a newspaper’s value to advertisers. This is measured in terms of circulation. How many people read the newspaper? Circulation depends on ___________ (9) on the work of the circulation department and on the service or entertainment offered in a newspaper’s pages. But for the most part, circulation depends on a newspaper’s value to readers as a source of information _____________ (10) the community, city, country, state, nation and world and even outer space. (30.0分)
【多选题】Refer to the exhibit. What are three of the basic components of a VoIP network？（）
A.
software voice applications
B.
multipoint control unit （MCU）
C.
gatekeeper
D.
call agent
E.
interactive voice response （IVR） systems
F.
softphones
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