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【单选题】
以下关于模块module的描述中错误的是哪一项？A.
一个完整的Python文件即是一个模块，是增强Python功能的扩展
B.
用import导入了模块之后，可以按照“模块.函数”的格式使用这个模块的函数
C.
可以使用变量来引用函数，例如可以通过bar=math.sqrt进行赋值，然后就可以使用bar来进行计算平方根，例如bar(9)结果是3.0
D.
Python目前还不支持一次性导入多个模块
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