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Python程序设计单选题中等

以下哪项可以用来从一个模块中导入特定的函数或变量?

0{ "key": "A", "text": "import math" }
1{ "key": "B", "text": "from math import sqrt" }
2{ "key": "C", "text": "import math as m" }
3{ "key": "D", "text": "import math.sqrt" }