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函数String（n,"str")的功能是（)。A．把数值型数据转换为字符串B．返回由n个字符组成的字符串C．从字

函数String(n,"str")的功能是()。

A．把数值型数据转换为字符串

B．返回由n个字符组成的字符串

C．从字符串中取出n个字符

D．从字符串中第n个字符的位置开始取字符串

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Refer to the exhibit.Which two statements are true of the interfaces on switch1？（）

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第2题

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第3题

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第4题

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第6题

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