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【单选题】
当电流脉冲频率增加时，电弧力的变化逐渐（ ）电流的变化。当频率高于几千Hz时，在平均电流值相同的情况下，随着电流脉冲频率的增加，电弧力（ ）A.
滞后，增大
B.
滞后，增大
C.
提前，减小
D.
提前，减小
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反馈参考答案：
举一反三
【多选题】What are the common methods of comparison and contrast essays?( )
A.
Point-by-point
B.
Block contrast and comparison
C.
Comparison and contrast
【多选题】Phrases used to introduce a contrast:
A.
In contrast ...
B.
In the same way ...
C.
Conversely ...
D.
Likewise ...
【单选题】下面代码的输出结果是 x = "Happy Birthday to you!" x * 3
A.
Happy Birthday to you!
B.
系统报错
C.
Happy Birthday to you! Happy Birthday to you! Happy Birthday to you!
D.
Happy Birthday to you!Happy Birthday to you!Happy Birthday to you!
【简答题】A．conflict B．comparison C．contradiction D．contrast
【单选题】下面代码的输出结果是 s = "Hello World! " print(s.split(' '))
A.
['Hello', 'World!']
B.
Hello World !
C.
HelloWorld!
D.
系统报错
【多选题】In a comparison or contrast essay, which of the following structure words are helpful for contrast?
A.
likewise
B.
whereas
C.
in contrast
D.
also
【单选题】下面代码的输出结果是 for i in "Python": print(i,end=" ")
A.
P,y,t,h,o,n,
B.
P y t h o n
C.
Python
D.
P y t h o n
【简答题】A．correlate B．relate C．compare D．contrast
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