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【简答题】
为了保持波源的振动不变，需要消耗4．0W的功率．若波源发出的是球面波(设介质不吸收波的能量)，求距离波源5m和10．0m处的能流密度．
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举一反三
【简答题】Studying abroad is a good chance to experience a different campus culture. Now listen to a news report and choose the best answer to each of the questions you hear.
【单选题】根据课程,下列何者为非 ?
A.
刘邦永不放弃的精神值得学习
B.
刘邦自作主张、态度傲慢导致失败
C.
项羽没有失败过导致第一次失败就放弃自我
D.
刘邦的团队有共同愿景一起朝目标迈进
【单选题】根据课程, 下列何者为非?
A.
刘邦永不放弃的精神值得学习
B.
项羽没有失败过导致第一次失败就放弃自我
C.
刘邦自作主张、态度傲慢导致失败
D.
刘邦的团队有共同愿景一起朝目标迈进
【单选题】Nowadays, Chinese consumers are increasingly aware of their rights. , safety and quality issues remain top concerns.
A.
Therefore
B.
Instead
C.
However
D.
Anyhow
【判断题】Only cash payments are accepted by consumers nowadays because mobile payments are not safe.
A.
正确
B.
错误
【单选题】Nowadays its trendy for young consumers to follow “Wang Hong” for cloths shopping. In marketing we see “Wang Hong” as a type of
A.
Social class
B.
Lifestyle
C.
Opinion leaders
D.
Perceptions
【单选题】Consumers nowadays are _____ with advertisements and brand promotion information.
A.
influence
B.
bombarded
C.
filled
【单选题】Nowadays consumers become more and more practical and buy only _______ they need.
A.
where
B.
which
C.
when
D.
what
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