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【单选题】
低压自动开关的热脱扣器在( )情况下自动动作。A.
设备过载
B.
设备短路
C.
线路断路
D.
设备欠压
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【简答题】英文字符A所对应的ASCII码是( )。
【简答题】The average code length for an information source S is strictly less than __________.
【简答题】英文字符a所对应的ASCII码是( )。
【简答题】Consider a code that satisfies the suffix condition: No codeword is a suffix of any other codeword. (i) Is this a uniquely decodable code? Why? (ii) Can you relate the minimum average length of Suffix...
【简答题】?LEN(“计算机”)＜LEN(“COMPUTER”)=【 】。
【单选题】What will be the output of the following Python code? a=["Apple","Ball","Cobra"] a.sort(key=len) print(a)
A.
[‘Apple’, ‘Ball’, ‘Cobra’]
B.
[‘Ball’, ‘Apple’, ‘Cobra’]
C.
[‘Cobra’, ‘Apple’, ‘Ball’]
D.
Invalid syntax for sort()
【单选题】In the relation of tblHire (Loan_Num, ember_Id,Video_Code,Hire_Period, Issue_Date,Due_Date,Return_Date, Reminded,Fine,Paid), Which SQL statements can find the average fine(s) by video where the averag...
A.
select Video_Code,AVG(Fine) as Average_Fine from tblHire group by Video_Code where AVG(Fine)>24;
B.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire group by Video_Code order by Video_Code having AVG ( Fine )> 24 ;
C.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire where Fine > 24 ;
D.
select Video_Code , AVG ( Fine ) as Average_Fine from tblHire group by Video_Code having AVG ( Fine )> 24 ;
【简答题】Determine Θ for the following code in the average case. Assume that all variables are of type int.
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