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【单选题】
解调器应用在通信系统的 。A.
接收端
B.
发送端
C.
信道
D.
A和B
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举一反三
【单选题】Some agers _____ their health because they often expose themselves to so many electric products. [ ]
A.
have damaged
B.
are damaging
C.
damaged
D.
will damage
【简答题】Research and Development Dept.(R&D)
【简答题】What is R&D dept.?
【简答题】Using tables of reduction potentials, predict the products of the reac tions of withexcess(a)Fe 2+ (b)Zn (c)Fe (d)H -
【单选题】We learn from the text that users of wireless products are more often than not confronted with
A.
missing networks.
B.
technical failures.
C.
wrong standards.
D.
confusing choices.
【简答题】They often choose to advertise their products ______ _______.
【单选题】（ ）products often feature s with learning embedded into them.
A.
Program
B.
Database
C.
Software
D.
Multimedia
【单选题】Industrial products are often the result of ______ according to the passage.
A.
laboratory work
B.
market survey
C.
commercial research
D.
business growth
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