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【单选题】
图5为单相桥式整流滤波电路,u i 为正弦电压,其有效值为U i =20V,f=50Hz。若实际测得其输出电压为28.28V,这是由于( )的结果A.
C开路
B.
C的容量过小
C.
C的容量过大
D.
R L 开路
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举一反三
【简答题】编写程序,求数值型方阵(存放在二维数组中)中,主对角线与副对角线上的对应元素的平方差及其平方差的和(数组中数据随机产生),将最终的程序复制粘贴到学习空间。
【单选题】According to N. Chomsky, a speaker can produce and understand an infinitely large number of sentence because _______.
A.
he has come across all of them in his life
B.
he has internalized a set of rules about his language
C.
he has got a chance to talk with others
D.
he has learned all the rules of his language
【简答题】旅游安全管理的主体,包括 、 、 、 。
【单选题】Why do people still argue about who deserves the credit for the concept of the laser?
A.
The researchers' notebooks were lost.
B.
Several people were developing the idea at the same time.
C.
No one claimed credit for the development until recently.
D.
The research work is still incomplete.
【单选题】Why do people still argue about who deserves the credit for the concept of the laser?
A.
The researchers' notebooks were lost.
B.
Several people were developing the idea at the same time.
C.
No one claimed credit for the development until recently.
D.
The work is still incomplete.
【单选题】According to the passage, the concept of systems involves all of the following EXCEPT
A.
the components of a collection
B.
the functional relationships among parts
C.
the links between different systems
D.
the origin of the scientific method
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