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question_answer #4190
openanswer_ana
Status:
New
Priority:
Normal
Assignee:
-
Start date:
01/26/2024
Due date:
% Done:
0%
Estimated time:
answer:
- '选项A: 并集使用逗号：,'
answer_analysis:
逗号表示并集，空格是子孙，大于号是父子，加号是相邻兄弟
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