iOS was developed by Apple and originally called iPhone OS.
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Device drivers make copies of files to be used in case the originals are lost or damaged.
A. 对
B. 错
Antivirus programs guard your computer system against viruses.
A. 对
B. 错
下述操作不改变对象本身的是?
A. List.insert(2,‘A’)
B. Tuple.copy()
C. del Dict[‘key1’]
D. Set.add(‘A’)
Python中的数据结构可分为可变类型和不可变类型,下面属于不可变类型的是?
A. 字典
B. 列表
C. 字典中的键
D. 集合(set类型)