ExCel文档的扩展名是( )。A..pptB..txtC..xslD..doc...

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【单选题】

ExCel文档的扩展名是( )。

.ppt

.txt

.xsl

.doc

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参考答案：

举一反三

【简答题】Stressful environments lead to unhealthy behaviours such as poor eating habits,____________(这进而增加了得心脏病的危险)

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【简答题】A．The exam format is still underway. B．The exam format is not any easier. C．The exam format hasn't been tested yet. D．The exam format hasn't been introduced yet.

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【简答题】Stressful environments lead to unhealthy behaviorssuch as poor eating habits, which _____ increase the risk of heart disease. A. in turn B. in return C. bychance D. by turns

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【简答题】They have family responsibilities and a stressful life.

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【简答题】A．solemn B．sarcastic C．slender D．stressful

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【判断题】明末的辽事问题是从努尔哈赤攻陷抚顺开始的。()

正确

错误

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【简答题】两个有限长的复序列x[n]和h[n],其长度分别为N 和M,设两序列的线性卷积为y[n]=x[n]*h[n],序列y[n]的有效长度为____。

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【单选题】数据解封装的过程是()。