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【单选题】
下列关于Cl、N、S、Si等非金属元素的单质或化合物的说法错误的是A.
硅是制造太阳能电池的材料
B.
NO、SiO 2 ,SO 3 通过化合反应生成
C.
实验室可用NaOH溶液处理Cl 2 和SO 2 废气
D.
实验室可用浓硫酸干燥氨气
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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...
【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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