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【单选题】
多频电路(非正弦交流)---21153 图示周期函数f(t)的叶级数展开式各项中系数为零的是 答( )A.
所有余弦项的ak
B.
所有正弦项的bk
C.
k为奇数的ak
D.
k为奇数的bk
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举一反三
【简答题】什么叫搜索引擎?搜索引擎的类型有哪些?
【简答题】A．维拉帕米 B．硝苯地平 C．尼莫地平 D．吗啡 E．普萘洛尔 伴支气管哮喘的高血压患者不宜选用：
【单选题】—Hi, Mr. Smith. Which department do you work in? —I am in the Marketing Department now, but I ________ in the Sales Department before long.
A.
worked
B.
will work
C.
have worked
D.
will have worked
【单选题】After I ______ the work of the department, I was transferred to another one.
A.
learnt
B.
had learnt
C.
would learn
D.
was learning
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