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【单选题】
在Excel 2010的A1单元格中插入系统当前日期的最快捷操作方法是______。
A.
查询系统当前日期，然后在A1单元格直接以"年/月/日"的格式输入即可
B.
单击A1单元格，按"Ctrl+;"组合键
C.
通过"插入"→"日期和时间"命令实现
D.
单击A1单元格，按"Ctrl+Shift+;"组合键
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【单选题】肝素抗凝血作用的主要机制是
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