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【判断题】
任何一个二端网络，都可以用一个电压源模型代替。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】下列代码运行结果是() lst=list('abcd') lst.append('a') lst
A.
['a', 'b', 'c', 'd']
B.
['a', 'a',, 'b', 'c', 'd']
C.
['a', 'b', 'c', 'd', 'a']
D.
[ 'b', 'c', 'd']
【单选题】以下代码的输出结果是 lst1 = [1, 2, 3, 4, 5] lst2 = ['a', 'b'] lst1.extend(lst2) lst1.insert(0,0) lst1.remove('a') lst1.reverse() print(lst1)
A.
['b', 'a', 5, 4, 3, 2, 1]
B.
[0, 1, 2, 3, 4, 5, 'a', 'b']
C.
[0, 1, 2, 3, 4, 5, 'b']
D.
['b', 5, 4, 3, 2, 1, 0]
【单选题】When the “free trial” deadline is over, you’ll be charged without notice for a product or service if ________.
A.
you happen to reveal your credit card number
B.
you fail to cancel it within the specified period
C.
you fail to apply for extension of the deadline
D.
you find the product or service unsatisfactory
【单选题】When you arrive at the hotel, you’ll______ notice the friendly staff, who will make your holiday a wonderful dream.
A.
sensitively
B.
scarcely
C.
immediately
D.
obviously
【单选题】When the 'free trial' deadline is over, you'll be charged without notice for a product or service if______.
A.
you fail to cancel it within the specified period.
B.
you happen to reveal your credit card number.
C.
you find the product or service unsatisfactory.
D.
you fail to apply for extension of the deadline.
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