A. 返回字典d中键值对为x:y的值 B. 返回字典d中键为x值，如果不存在则返回y C. 返回字典d中键为x值，如果不存在则返回空 D. 返回字典d中键为x值，如果不存在则报错
A. 11 B. 40 C. 10 D. 系统出错
A. [9,6,4,5] B. [5,6,9,4] C. [5,4,6,9] D. [9,4,6,5]
A. ["Python","Python"] B. ["PP","yy","tt","hh","oo","nn"] C. "Python","Python" D. "PP","yy","tt","hh","oo","nn"
A. [3,5,7,9] B. [4,6,8,9,10] C. [2,3,5,7] D. [4,6,8,9]
A. 判断x是否是字典d中的键 B. 判断x是否是字典d中的值 C. 判断x是否是字典d中的键或值 D. 若x是一个二元数据，则判断x是否是字典d中的键值对
A. S和T的并运算，包括集合S和集合T中的所有元素 B. S和T的交运算，包括同时在集合S和集合T中的元素 C. S和T的差运算，包括在集合S但不在集合T中的元素 D. S和T的补运算，包括集合S和集合T中的不相同元素
A. "_alex_eric_rain" B. "alex_eric_rain" C. "alex_eric_rain_" D. "_alex_eric_rain_"
A. <class 'dict'> B. <class 'set'> C. <class 'list'> D. <class 'tuple'>
A. ["aa","bb","cc","dd"] B. ["cc","dd","aa","bb"] C. ["ac","ad","bc","bd"] D. ["ca","cb","da","db"]
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